How To Use Sex chromosome In A Sentence
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Linkage groups are designated by roman numerals and X for the sex chromosome.
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However, to understand the current structure of sex determination in Drosophila, it is necessary to consider its evolution from an ancestral state, prior to the evolution of heteromorphic sex chromosomes and dosage compensation.
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The results are attributed to introgression with a higher rate for autosomes than for sex chromosomes.
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The sex chromosomes, together with the homologous no.7 chromosomes of the West Japan and Kanto forms, are diagrammatically shown.
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White campion is one of the few examples of plants with separate sexes and with X and Y sex chromosomes.
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In some dioecious species, sex determination is controlled by genes on sex chromosomes.
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In a population with variation on both sex chromosomes, one does not know which sex chromosome carries a specific allele in a heterozygote of the heterogametic sex.
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The chromosomal complement of each cell is divided into the autosomes and the sex chromosomes.
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Note that the bivalent sex chromosome remaining in the vicinity of the equator appears to be oriented to the poles.
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humans have 22 chromosome pairs plus two sex chromosomes
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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.
Carin Bondar: Is Your Crappy Boyfriend Stressing You Out? You Are Not Alone...
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In contrast, in all tef cells in which the sex chromosomes could be identified, they were closely apposed in a configuration not discernibly different from wild type.
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However, the sex chromosomes of birds contain a complement of genes different from those on the mammalian sex chromosomes, and the heterogametic sex is the female.
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mammals normally have two sex chromosomes
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Whether sex chromosomes and autosomes differ in their conjunctive mechanism is an unresolved issue.
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For most people, the genome consists of one pair of sex chromosomes (XX in women and XY in men) and twenty-two pairs of chromosomes called autosomal, plus mitochondrial DNA, which is something of a separate story.
'Blood Matters'
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A2; the locus is assumed to be on an autosome, not a sex chromosome.
Population Genetics
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Sex chromosomes in M. violaceum were identified by the cosegregation of mating type and chromosome dimorphism and by mating-type-specific markers.
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These results support the hypothesis that transposons accumulate in nonrecombining regions and may be one cause of the heteromorphism of sex chromosomes.
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The sex chromosomes are placed to the right of the smallest autosomal chromosomes.
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It may be of interest to examine the sperm of men with different sized Y chromosomes to see whether there is a relationship between the level of sex chromosome disomy and Y chromosome size.
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Birds differ from the human species as to internal secretory action in two vital particulars: (a) In the higher mammals, sex depends upon a "complex" of all the glands interacting, instead of upon the sex glands alone as in birds; (b) The male bird instead of the female is homogametic for sex -- i.e., the sperm instead of the eggs is uniform as to the sex chromosome.
Taboo and Genetics A Study of the Biological, Sociological and Psychological Foundation of the Family
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But what the newly sequenced genome reveals is that the platypus's male-determining gene, the monotreme equivalent of primates' SRY gene, is not located on any of those five pairs of sex chromosomes.
Archive 2008-05-01
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In organisms in which gender is based on one sex being homomorphic and the other heteromorphic for the sex chromosomes, a process has evolved to equalize the output of products encoded by the genes located there.
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Chromosome heteromorphism therefore reflects de novo evolution of sex chromosomes during the evolution of dioecy in this plant lineage, a relatively recent event within this genus.
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NO dimorphic sex chromosomes were observed in either sexof the three species examined.
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From the cytogenetic perspective, only a small proportion of fish species have heteromorphic sex chromosomes.
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Silene latifolia is a dioecious plant with heteromorphic sex chromosomes.
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Next we asked whether sex chromosomes and autosomes contribute equally to the patterns of inheritance.
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The evolution of the heteromorphic sex chromosomes from an indistinguishable pair of autosomes is triggered by the suppression of recombination.
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Male birds are homogametic, with sex chromosome constitution designated ZZ, while females are heterogametic, with sex chromosomes ZW.
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All four populations had 2n = 38, with ZZ/ZW sex chromosomes (Z, acrocentric; W, submetacentric).
BioMed Central - Latest articles
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The sex chromosomes and autosomes spend different times in the germ line of the two sexes.
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Several DNA sequences that show sequence similarity to transposons were isolated from these sex chromosomes.
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Several pieces of direct and indirect evidence suggest that dimorphic sex chromosomes have evolved from an originally homologous pair of chromosomes.
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Like humans, sand lizard males have heterogametic sex chromosomes.
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It possesses a pair of heteromorphic sex chromosomes; females are homogametic and males heterogametic.
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I then present a formal model for the evolution of recombination dimorphism on autosomes and on sex chromosomes.
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All four populations had 2n = 38, with ZZ/ZW sex chromosomes (Z, acrocentric; W, submetacentric).
BioMed Central - Latest articles
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This was explained by the action of rare alleles of autosomal modifiers that can influence or override the sex chromosome genes.
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The fruit fly Drosophila melanogaster has two sex chromosomes and three autosomes.
