Choose the incorrect statement from the following:a)Colostrum contains...
The Option (C) is correct
During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum.
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Choose the incorrect statement from the following:a)Colostrum contains...
Explanation:
Polyspermy is a condition where more than one sperm fertilizes an egg. This results in an abnormal number of chromosomes in the zygote and can lead to developmental problems. Therefore, polyspermy is prevented by various mechanisms in the egg surface. These include:
- Chemical changes: The egg surface undergoes rapid changes after the entry of the first sperm. This prevents the entry of any other sperm by causing a physical barrier or by altering the electrical charge of the membrane.
- Cortical reaction: The entry of the sperm triggers the release of cortical granules from the egg. These granules release enzymes that cause changes in the egg surface, making it impenetrable to other sperm.
- Zona reaction: The zona pellucida, a glycoprotein layer surrounding the egg, also undergoes changes after fertilization. This prevents the binding of any other sperm.
Therefore, option D is incorrect as chemical changes in the egg surface are one of the mechanisms that prevent polyspermy, and not the cause of it.
Choose the incorrect statement from the following:a)Colostrum contains...
Wrong answer correct answer is C
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