In the block to polyspermy, entry of the sperm's contents causes calcium ion levels in the oocyte's cytoplasm to rise, triggering the cortical reaction.
In biology, polyspermy describes the fertilization of an egg by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent.
The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome—one from the egg and one each from multiple sperm. Usually, the result is an unviable zygote. This may occur because sperm are too efficient at reaching and fertilizing eggs due to the selective pressures of sperm competition.
The cortical reaction is a calcium-dependent exocytotic process in which the content of secretory granules is released into the perivitellin space immediately after fertilization, which serves to prevent polyspermic fertilization.
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<span>I believe the answer is two ureters.</span>
Answer:
The amount of urine produced depends on the amount of excess water and dissolved wastes that are present in the body. Other factors such as habitat and hormone such as Anti-diuretic hormone (ADH) also regulates the amount of urine produced. When excess water is more in the body, diluted urine is excreted whereas when the excess water is less, the urine is concentrated.
Explanation:
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