How To Use Egg cell In A Sentence
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The egg cells and antherozoids are collectively known as gametes, and the generation of the moss plant that bears them is known as a gametophyte.
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Embryos that are trisomic contain, instead of matched pairs of chromosomes, one too many of a given chromosome, most commonly chromosome 13, 18, 21 (which is responsible for Down syndrome), X, or Y. Trisomies are the result of a glitch known as nondisjunction, which occurs principally during the creation of egg cells (although sperm cells may also exhibit such errors).
Delayed Childbearing
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On their release from the antheridia, the antherozoids must then swim through surface water to fertilize neighbouring egg cells.
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The reciprocal cross in which tetraploid PAX was used as the seed parent produced only pentaploid offspring, indicating that PAX produced unreduced egg cells that were fertilized (P. J. VAN DIJK, unpublished data).
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They transferred its nucleus to an egg cell from which the nucleus had been removed.
Times, Sunday Times
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They were then injected into egg cells before the embryos were implanted in female mice.
Times, Sunday Times
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The reason for aneuploid embryos are mostly aneuploid oocytes immature egg cells, as aneuploid sperm are relatively rare with an estimated frequency of about 2 per cent, while aneuploid oocytes are quite common with an estimated frequency of more than 20 per cent," he says.
CBC | Top Stories News
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They transferred its nucleus to an egg cell from which the nucleus had been removed.
Times, Sunday Times
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The asexuality may be of any kind including apomixis (reproduction by unreduced egg cells).
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An egg cell is enucleated, that is, the nucleus is removed and replaced with the nucleus from the body cell of an animal of the same kind.
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Once the pollen has fertilized the egg cell contained within the ovule, the ovule develops into a seed, and the ovary of the enclosing carpel begins to enlarge and ripen, forming the fruit.
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Dispersed by wind, these small spores germinate into small, freeliving, disc-shaped gametophytes that produce either archegonia - organs in which egg cells are formed - or sperm-producing antheridia.
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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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Once the embryo divided into eight cells, the cells were carefully separated, and DNA from each cell was inserted into fresh egg cells whose DNA had been removed.
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SCNT involves transferring the nucleus of a somatic cell (any body cell other than a sperm or egg cell) into an enucleated oocyte, i.e. an oocyte from which the nucleus and thus most of the DNA has been removed.
Cloning
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Double fertilization of egg cell and central cell initiates development of the diploid embryo and the triploid endosperm, respectively.
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Angiosperm seeds are comprised of an embryo and endosperm resulting from double fertilization of the egg cell and two polar nuclei, respectively.
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Numerous antherozoids are produced in the antheridia and they swim through the covering film of water to reach the archegonia, each of which contains a single egg cell.
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It is, furthermore, the case that the embryo sac itself also exhibits polar organization, with the egg cell and synergids adjacent to the micropyle, while the antipodal cells are found at the opposite chalazal end.
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To create the banteng, scientists inserted DNA from the dead banteng's skin cells into egg cells from closely related domestic cows, producing embryos.
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They were then injected into egg cells before the embryos were implanted in female mice.
Times, Sunday Times
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In the caricatured version, preformationism has usually been ridiculed as the belief that a perfect homunculus lies within each sperm or egg cell.
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The brown membrane surrounding the egg cell is the zona pellucida. The head of the sperm carries special enzymes to dissolve this membrane, which it must do in order to fertilise the egg.
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Stripped of its own genetic instructions, the recipient egg cell is a tiny biological machine awaiting orders.
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A single egg cell replicates itself, and the offspring cells in turn replicate themselves, and so on.
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It produces the female egg cells necessary for reproduction, called the ova or oocytes.
CreationWiki - Recent changes [en]
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Similarly, the enucleated egg cell, having lost all of its own DNA, has no potential of ever becoming a living organism, and therefore also does not seem deserving of moral status.
The Language of God
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They transferred its nucleus to an egg cell from which the nucleus had been removed.
Times, Sunday Times
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It is filled with a colorless tissue, the prothallium, and if mature, with care it is possible to see, even with a hand lens, two or more denser oval bodies (_ar. _), the egg cells of the archegonia, which here are very large.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
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Each consists of an egg cell embedded in the tissue of the female gametophyte surrounded by a thick seed coat.
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The egg cell is fertilized by pollen from the male sex organs, the stamens.
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A sperm cell has no individual identity - a human being cannot develop from a sperm cell, and its genetic information can make a contribution to the identity of a person only in the presence of an egg cell.
Matthew Yglesias » Too Hot for CBS
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They were then injected into egg cells before the embryos were implanted in female mice.
Times, Sunday Times
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It is, furthermore, the case that the embryo sac itself also exhibits polar organization, with the egg cell and synergids adjacent to the micropyle, while the antipodal cells are found at the opposite chalazal end.
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The fuss about SCNT derives from the fact that this bizarre fusion of udder cell and enucleated egg cell ultimately resulted in Dolly.
The Language of God
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Shortly before the archegonium opens, the canal cells become disorganized in the same way as in the bryophytes, and the protoplasm of the central cell contracts to form the egg cell which shows a large, central nucleus, and in favorable cases, a clear space at the top called the "receptive spot," as it is here that the spermatozoid enters.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
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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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The unfertilised egg cell began to divide to produce embryos that sometimes developed well.
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The formation of the female gamete (megagamete or egg cell) can be subdivided into two stages, megasporogenesis and megagametogenesis.
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If it does not implant, then (fertilized or not) that egg cell is released from the body during a woman's normal menstruation.
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Finally the pollen tube penetrates down to and through the open neck of the archegonium, until it comes in contact with the egg cell.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
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So the genetic information that determines a snail shell's coiling direction can not be found in the snail's own cells, but in those of the mother animal - in the case of the hermaphroditical land snails the snail the egg cell was from.
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Comparing this now with the development of the sporogonium in the bryophytes, it is evident that the young fern is the equivalent of the sporogonium or spore fruit of the former, being, like it, the direct product of the fertilized egg cell; and the prothallium represents the moss or liverwort, upon which are borne the sexual organs.
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses