How To Use Meiosis In A Sentence
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Barot A, Kleckner N (2008) Yeast Pch2 promotes domainal axis organization, timely recombination progression, and arrest of defective recombinosomes during meiosis.
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This can happen either occasionally during cell wounding or regularly during cytokinesis and meiosis.
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Sutton worked with grasshopper chromosomes, and it was in this paper that he showed that chromosomes occur in distinct pairs, which segregate at meiosis.
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Our analysis of 1170 mammalian karyotypes provides strong evidence that karyotypic evolution is driven by nonrandom segregation during female meiosis.
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For example, opposite arms may be juxtaposed during prophase of meiosis, providing opportunities for gene-conversion type events.
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A pine tree is called a sporophyte because it develops from a spore produces spores is haploid can reproduce sexually and asexually cannot undergo meiosis
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Homologous chromosomes are fully aligned at the pachytene stage, and germ cells survive to complete meiosis and gametogenesis with high efficiency.
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After meiosis, the four meiotic products undergo an additional mitotic division to yield eight haploid nuclei, which differentiate into an octad of eight ascospores.
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An obvious question is whether the mat bias is absent in azygotic meiosis after homologous chromosomes have coexisted in diploid cells for many mitotic divisions.
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Crossing over ensures segregation of homologous chromosomes in meiosis I.
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Meiosis results in the production of four megaspores, containing half the number of chromosomes of the sporophyte.
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I thought also that he should have defined such terms as autosome, metastasis, meiosis, and maybe even facultative as it is used in biology.
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Such results can be related to the formation of meiotic trivalent in the hybrids leading to the production of viable aneuploid gametes and post-zygotic elimination of embryos due to chromosomal non disjunction events at meiosis.
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Different from bivalent polyploids, multivalent polyploids pair their chromosomes among more than two homologous copies at meiosis.
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All alien chromosomes behaved as univalents during meiosis.
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Each basidiospore contains a recombinant haploid nucleus, the product of meiosis.
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My personal hope is that students will have some intuitive understanding of meiosis as the physical basis of genetics.
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In the ovules of most sexual flowering plants female gametogenesis is initiated from a single surviving gametic cell, the functional megaspore, formed after meiosis of the somatically derived megaspore mother cell (MMC) 1, 2.
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Several studies show involvement of telomeres in the pairing of homologs during meiosis.
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Mitosis and meiosis divisionsexual reproduction possible . Each means of passing on hereditary information has advantages.
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Genetics: a characteristic resulting from the exchange of genetic material between homologous chromosomes during meiosis.
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It ensures proper chromosome segregation by forming a physical link between homologs during meiosis.
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A preliminary genetic linkage map indicated that the DIP-locus lacks suppression of recombination, which is unique among all other map-based cloning efforts of apomeiosis to date.
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Marked RNA synthesis occurs in the tapetal cells at all stages of meiosis with a peak at diplotene, indicating that long before the tapetum begins to disintegrate it acquires a complex set of specifications in the form of mRNAs.
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Meiosis produces 4 gametes, ie. isogamy, anisogamy and oogamy, which through mitosis develops into mature gametes.
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Higher Education (University +) apospory is The development of a gametophyte directly from a sporophyte without the occurrence of meiosis or spore formation and apogamy is Why do leaves turn colors in the fall but not grass?
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A given factor s can affect the recombination rate r through a change in the number of chiasmata occurring during meiosis.
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Models for genetic recombination have been proposed to explain the properties of genetic exchange during fungal meiosis.
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Meiosis is the component of gametogenesis responsible for the segregation of homologous chromosomes into haploid gametes.
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During meiosis I, the replicated sister chromatids pair with their homologs but segregate as a single unit.
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The receptacles are reproductive branches and contain many cavities with external pores which contain antheridia and oogonia, then through meiosis, sperm and egg are produced.
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During meiosis I, the replicated sister chromatids pair with their homologs but segregate as a single unit.
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Several studies show involvement of telomeres in the pairing of homologs during meiosis.
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This result suggests that HA-spo 14 is phosphorylated during meiosis and reaffirms our previous data that demonstrated that the N terminus of Spo 14 is the major site of phosphorylation.
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We also began by considering the results of a single meiosis, which I could demonstrate by labeling and moving around transparent coloured strips on the overhead projector, and then moved to considering the pooled results of the many meioses that produce, for example, sperm.
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Moreover, the correlation of PMC meiosis, phylliform index and RAPD marker was discussed.
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A second checkpoint pathway, the spindle checkpoint, operates at a similar point in meiosis, preventing progression into anaphase if the spindle apparatus fails to connect appropriately with kinetochores.
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Immature human eggs, or oocytes, sit in suspended animation in the ovaries from the time they are formed in the female fetus, and complete the process of meiosis to form mature egg cells only just prior to ovulation.
Delayed Childbearing
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White mutant diploid zygospores did not germinate (undergo meiosis) when subjected to low light (8 mol photons m - 2 sec - 1) overnight.
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Eventually, the dikaryon forms sexual sporangia in which the nuclei fuse into one, which then undergoes meiosis to form haploid spores, and the cycle is repeated.
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Peirce's Hegelianism, which he increasingly professed as he approached his most mature philosophy, is more difficult to understand than his Kantianism, partly because it is everywhere intimately tied to his entire late theory of signs (semeiotic) and sign use (semeiosis), as well as to his evolutionism and to his rather puzzling doctrine of mind.
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Bryophytes reproduce through syngamy and meiosis, but the dominant stage of the plant is the gametophyte, as opposed to the sporophyte in vascular plants.
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Sexual plant reproduction involves a reduction of the somatic chromosome number by meiosis followed by a restoration of the somatic chromosome number by fertilization.
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Mutants have multipolar spindles in male meiosis and irregular mitotic figures in the larval neuroblasts, which is the result of aberrant behavior of the mitotic spindle during embryonic cleavage.
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All 40 chromosomes of mouse oocytes are telocentric, so homologs form bivalents in meiosis I while sister chromatids form univalents in meiosis II
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After a few more days of incubation, the ends of some mycelia may enlarge and form basidia within which nuclear fusion and meiosis may occur.
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Under continuous light, the maturation starts but stops halfway: meiosis in the basidia is arrested at prophase I, the stipe elongates only slightly, and the pileus does not expand.
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Incorrect chromosome division during meiosis is the commonest cause of spontaneous miscarriage during pregnancy, and an extra chromosome 21 in humans leads to Down's syndrome.
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Several of these articles dealt with mutants affecting synapsis, meiosis, or disjunction.
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Second, the centromere is the focus for the formation of the kinetochore, where microtubules connect to the chromosomes during anaphase in mitosis and meiosis.
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Pairing is an essential step in organizing and properly distributing homologous chromosomes during meiosis.
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The nucleus of sperm and eggs are haploid, meaning they only have half their normal compliment of genetic material, while somatic cell nuclei are diploid (it occurs to Sci that she's gonna have to explain meiosis some day ...).
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Thus it not only had nucleosomes and histone acetylation and methylation, but was also sexual with meiosis and a bouquet stage.
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Meiosis occurs just before mating in well-differentiated oogonia and antheridia.
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The centromere is responsible for two key chromosomal functions in mitosis and meiosis.
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In the filial generation, haplosis is by meiosis to produce spores infectious for a copepod intermediate host.
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The transmission of genes from parent to offspring is carried out in a special process of cellular division called meiosis, which produces gamete cells containing one chromosome from each paired set.
Molecular Genetics
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The process of gamete formation involves a specialized form of cell division called meiosis, which is tightly regulated by molecular processes within the cell.
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These mated cells can grow in filamentous form with meiosis occurring at the terminal cell (basidium) of the hyphae.
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The oogonia multiply by mitosis, but early in fetal life, they enter meiosis.
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During prophase I of meiosis, homologous chromosomes align, synapse, and cross over.
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Later, however, these germ cells undergo meiosis, to produce gametes.
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Well, it was more about the way chromosomes get divided or doubled in two processes called mitosis and meiosis.
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There are two types of thelytokous reproduction: apomixis - clonal reproduction, which can be diploid or polyploid - and automixis, a meiosis that takes place after which diploidy is restored.
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Like the gregarines, however, the life cycle is primarily haploid, with diploidy only occurring before meiosis.
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However, even in hermaphrodites, male and female meiosis may not occur at the same time - and therefore may occur under different conditions.
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Male meiosis of Drosophila melanogaster is unusual in some respects.
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Any reproductive process that does not involve meiosis or syngamy is said to be asexual, or vegetative.
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The six spreads with the most well-separated chromosomes were evaluated and showed the same characteristic quadrivalent structure during meiosis.
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Early in meiosis, each pair of homologs comes together to form a tetrad containing two pairs of sister chromatids.
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Since they are pure-bred cells, they are perfectly capable of meiosis.
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In both the cases, oocytes were exposed to the cytostatic chemical, nocodazole, from the time of hormonally stimulated resumption of meiosis.
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You could imagine an egg that failed to divide during meiosis.
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This does not prevent homologic alignement in meiosis and so fertility of hybrides is unhindered.
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The normal expression of proto-oncogenes plays an important role in the regulation of spermatogonial mitosis , spermatocyte meiosis as well as spermiogenesis and sperm maturation.
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The replication of chromosomes is the first detectable cytological event in meiosis.
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chromosomes are distributed by spindles in mitosis and meiosis
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Genes in clusters 4-8 showed a dramatic and continual increase in expression coincident with the onset of meiosis or later.
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Because only homologous chromosomes pair, allopolyploids strictly exhibit bivalent formation (two chromosomes pair) at meiosis and undergo disomic inheritance for each locus.
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This work shows a direct connection between elevated levels of corticosterone and the sex ratio of resultant offspring, leading researchers to conclude that corticosterone may directly influence sex chromosome segregation during meiosis, or may lead to differential maturation rates of differentially sexed ova.
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Starvation induces expression of the ste 11 gene that encodes a key transcription factor, which, in turn, upregulates transcription of several genes involved in conjugation, meiosis, and sporulation.
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During sexual megagametophytic development (with the embryo sac as the megagametophyte and the egg cell as megagamete), a sub-epidermal cell of the nucellus tissue differentiates into a megaspore-mother cell which undergoes meiosis I and II to form four megaspores.
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Without such an ultimate and immediate signification instantiated in the formal signification of the mental concept, there would be, as John Raulin remarks, an infinite regress (processus in infinitum) in any signification, something like a Peircean ˜infinite semeiosis™. [
Medieval Semiotics
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This is illustrated by the fact that a considerable number of genes are required specifically for both conjugation and meiosis.
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Uniparental disomy and imprinting modify gene expression with passage through maternal or paternal meiosis.
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I warmed to the discussion, eager to share my knowledge of meiosis and mitosis, spermatogenesis and seminal vesicles, ovulation and the menstrual cycle.
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Most basidiomycete fungi do not undergo nuclear fusion to form diploid nuclei until just prior to meiosis.
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In maize terminalization occurs a the diplotene stage of meiosis.
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Even in a prison setting, noted Lucy Durmast drily to herself, the habit of meiosis didn't desert the medical profession.
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Early recombination nodules are protein complexes 100 nm in diameter that are associated with forming synaptonemal complexes during leptotene and zygotene of meiosis.
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Development of the spermatid flagellum begins immediately after meiosis.
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It’s possible the last time I heard the word meiosis was in my Anatomy and Physiology class in college.
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Most of what goes wrong during meiosis-to-fertilization-to-mitosis results in chromosomal abnormalities, usually nondisjunction, thus providing a mechanism for aneuplodiy -- rather than an insistence that it really does happen.
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In charophytes, the first cell division of the zygote is meiosis, and their plant body is gametophytic.
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In meiosis, the normal chromosome and the inverted chromosome will form a loop to allow pairing of specific DNA sequences.
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During in vivo development, maternal apomixis refers to the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization.
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Spores (n) Meiosis Female gametangium (n) 1 2 Mitosis and development 3 4 Mitosis and development 5 17.7
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Homologous chromosomes are fully aligned at the pachytene stage, and germ cells survive to complete meiosis and gametogenesis with high efficiency.
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Even in a prison setting, noted Lucy Durmast drily to herself, the habit of meiosis didn't desert the medical profession.
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In cells undergoing the sexual cell division process called meiosis, there are lots of double-Holliday junctions and lots of crossovers.
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Only 6% of zygotic cells complete meiosis and sporulate.
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From the 38 genes, 14 ~37% are annotated in the slim GO annotation as participating in cell-cycle,meiosis or cytokinesis.
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My own mnemonic system depends on the fact that the word meiosis has been “reduced,” from mitosis, to the extent of not containing the letter t.
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During meiosis, fibres called microtubules attach themselves to the centre kinetochore of the chromosomes.
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Objective: To determine the effect of methylbenzene on meiosis of spermatocyte from mouse testis.
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The process by which the DNA load is halved is termed meiosis.
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A further level of complexity is added in germ cells where homologous chromosomes pair and segregate in meiosis I and sister chromatids remain associated until meiosis II.
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In common snook, the germinal epithelium is active throughout the year, producing follicles where the oocyte is in arrested meiosis, diplotene of the first meiotic prophase, and the germinal epithelium is always discontinuous.
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This strongly suggests that the dyads corresponded to the final stage of sporogenesis and therefore that they occurred from a meiosis II-like division, rather than from a disrupted meiosis I.
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Centromeres are essential for the proper segregation of chromosomes at mitosis and meiosis.
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Meiosis is the process by which diploid organisms produce haploid gametes capable of sexual reproduction.
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This is evidence that the genes are evolving in a concerted manner, as might be predicted for genes that mispair very frequently in meiosis.
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During meiosis, homologous chromosomes become physically connected by the formation of chiasmata.
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Even in a prison setting, noted Lucy Durmast drily to herself, the habit of meiosis didn't desert the medical profession.
A DEAD LIBERTY
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Meiosis produces 4 gametes, ie. isogamy, anisogamy and oogamy, which through mitosis develops into mature gametes.
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You could imagine an egg that failed to divide during meiosis.
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This is because when they form they discard half of their chromosomes in a process called meiosis.
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Meiosis is the program used by sexually reproducing organisms to produce haploids from diploid precursors.
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In this case, the first postmeiotic cells deriving from the spores have been separated to yield octads composed of four pairs of colonies deriving from a single meiosis.
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It ensures proper chromosome segregation by forming a physical link between homologs during meiosis.
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At first called litotes or meiosis, such understatement came to be called irony, at least by the end of the sixteenth century.
IRONY
