polyspermy वाक्य
उदाहरण वाक्य
मोबाइल
- Still, after fertilization via intracytoplasmic sperm injection, the egg cell does not lose cell-surface expression of Juno, which suggests that Juno contributes to the prevention of polyspermy.
- Electrical polyspermy blocks operate in many animal species, including frogs, clams, and marine worms, but not in the several mammals that have been studied ( hamster, rabbit, mouse ).
- Many other functions for the egg jelly have been proposed including sperm agglomeration, protection from mechanical stress and polyspermy, and increasing the size of the egg to improve its chances of colliding with sperm.
- Animals such as sea urchins have a two-step polyspermy prevention strategy, with the fast, but transient, electrical block superseded after the first minute or so by a more slowly developing permanent mechanical block.
- It is thought that electrical blocks evolved in those species where a very fast block to polyspermy is needed, due to the presence of many sperm arriving simultaneously at the egg surface, as occurs in animals such as sea urchins.
- Polyspermy is apparently allowed; when the yolk passes through the infundibulum of the oviduct and is exposed to sperm storage glands, the sperm preferentially seek out the near center ( but not the exact center ) of the germinal disc region and break through the perivitelline membrane.
- He discovered what is known as the fast block to polyspermy; he further elucidated the slow block, which had been discovered by Fol in the 1870s; and he showed that the adhesive properties of the cells of the early embryo are surface phenomena exquisitely dependent on developmental stage.
- The trouble with that approach, from the egg's perspective, is that every sperm in the neighborhood has the same sense of urgency, and should more than one sperm manage to get past the zona pellucida _ a condition called polyspermy _ the whole business is lost : No embryo can result, and the egg dies.
- Granted, the overzealous sperm cells would not benefit from polyspermy either, but if each sperm is competing with all the other sperm cells to reach nuclear heaven, and if each is doomed should it fail to fertilize the egg in any case, it simply lacks the discipline, and the evolutionary incentive, to refrain from pushing.
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