MHT CET 202622 AprilMorning Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 22 April
- Shift
- Morning Shift
- Subject
- Biology
- Chapter
- Human Reproduction
MHT CET 2026 · 22 April · Morning Shift · Biology · Human Reproduction
The true mature ovum in human female with its vitelline membrane in...
The true mature ovum in human female with its vitelline membrane in contact with the sperm head shows the following features EXCEPT:
Options
- AIt completes meiotic division II
- BIts centriole develops the synkaryon spindle.
- CIt has a female pro-nucleus.
- DIt shows two polar bodies.
Correct answer
B. Its centriole develops the synkaryon spindle.
Step-by-step 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.
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.