Biology - Human Reproduction Question with Solution | TestHub
The true mature ovum in human female with its vitelline membrane in contact with the sperm head shows the following features EXCEPT:
Options:
Answer:
Solution:
In human females, the secondary oocyte is arrested in metaphase II of meiosis. When the sperm head comes in contact with the vitelline membrane, it triggers the completion of meiotic division II, resulting in the formation of a mature ovum and a second polar body.
At this stage, the ovum contains a female pronucleus and shows two polar bodies (the first polar body formed after meiosis I and the second after meiosis II).
However, the mature human ovum lacks a functional centriole. The proximal centriole is introduced by the sperm during fertilization, and it is this sperm centriole that divides and develops the synkaryon spindle for the first cleavage division. Therefore, the statement that the ovum's centriole develops the synkaryon spindle is incorrect.
Answer: Its centriole develops the synkaryon spindle.
