In a sexually reproducing organism, the chromosome number in the progeny does not double even after fertilization. The reason is that the male and female gametes contain:
Show Hint
- Contain half the number of chromosomes (n).
- Fertilization: n + n = 2n (restores diploid number).
- Maintains constant chromosome number across generations.
- Quarter set of somatic chromosomes
- Half-set of the somatic chromosomes
- Full set of the somatic chromosomes
- Inhibitor that destroys the extra chromosomes
The Correct Option is B
Solution and Explanation
This question tests knowledge of the chromosome number in gametes and the process of fertilization.
Step 2: Detailed Explanation:
In sexually reproducing organisms, gametes (sperm and egg) contain a half-set of the somatic chromosomes (haploid, n).
During fertilization, the haploid sperm (n) fuses with the haploid egg (n) to restore the diploid chromosome number (2n) in the progeny.
This prevents the chromosome number from doubling.
Other options:
- Quarter set (A): Incorrect, gametes are haploid (n), not n/2.
- Full set (C): Incorrect, gametes are haploid (n), not diploid (2n).
- Inhibitor (D): Incorrect, there is no inhibitor that destroys extra chromosomes.
Thus, the reason is that gametes contain a half-set of somatic chromosomes.
Step 3: Final Answer:
Thus, the male and female gametes contain a half-set of somatic chromosomes, which corresponds to option (B).
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