Question:
Which is correct about heterogametic sex determination?
Which is correct about heterogametic sex determination?
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Heterogametic sex produces two types of gametes (dissimilar), while homogametic sex produces one type (similar) with respect to sex chromosomes.
Updated On: Jun 19, 2026
- Males produce dissimilar gametes in male heterogamety
- Females produce dissimilar gametes in male heterogamety
- Males produce dissimilar gametes in female heterogamety
- Females produce similar gametes in female heterogamety
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The Correct Option is A
Solution and Explanation
Step 1: Understanding heterogametic sex.
In organisms with heterogametic sex determination, one sex produces two types of gametes with respect to sex chromosomes, while the other sex produces only one type.
Step 2: Male heterogamety.
In male heterogamety (like humans, XY system), males are XY and produce dissimilar gametes (X or Y), while females are XX and produce similar gametes (all X).
Step 3: Female heterogamety.
In female heterogamety (like birds, ZW system), females are ZW and produce dissimilar gametes (Z or W), while males are ZZ and produce similar gametes (all Z).
Step 4: Conclusion.
Thus, the correct statement about male heterogametic system is option (1).
In organisms with heterogametic sex determination, one sex produces two types of gametes with respect to sex chromosomes, while the other sex produces only one type.
Step 2: Male heterogamety.
In male heterogamety (like humans, XY system), males are XY and produce dissimilar gametes (X or Y), while females are XX and produce similar gametes (all X).
Step 3: Female heterogamety.
In female heterogamety (like birds, ZW system), females are ZW and produce dissimilar gametes (Z or W), while males are ZZ and produce similar gametes (all Z).
Step 4: Conclusion.
Thus, the correct statement about male heterogametic system is option (1).
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