Question:
Which of the following is correct in relation to ZO-ZZ type sex determination?
Which of the following is correct in relation to ZO-ZZ type sex determination?
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ZO-ZZ system: Male = ZZ, Female = ZO (seen in Lepidoptera insects).
Updated On: Jun 19, 2026
- Occurs in human beings
- Female is heterogametic
- Male is heterogametic
- Occurs in moths and some butter flies
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The Correct Option is D
Solution and Explanation
Step 1: Understand ZO-ZZ system.
ZO-ZZ type sex determination is a variant of chromosomal sex determination system found in certain insects.
Step 2: Identify sex chromosomes.
In this system, males are homogametic (ZZ) while females are heterogametic (ZO).
Step 3: Compare with humans.
Humans show XY system, not ZO-ZZ system, so option (1) is incorrect.
Step 4: Evaluate heterogamety.
In ZO-ZZ system, female is heterogametic, but the question asks correct general statement, not option (2).
Step 5: Identify occurrence.
ZO-ZZ system is found in moths and some butterflies.
Step 6: Conclusion.
Therefore, correct answer is moths and some butterflies.
ZO-ZZ type sex determination is a variant of chromosomal sex determination system found in certain insects.
Step 2: Identify sex chromosomes.
In this system, males are homogametic (ZZ) while females are heterogametic (ZO).
Step 3: Compare with humans.
Humans show XY system, not ZO-ZZ system, so option (1) is incorrect.
Step 4: Evaluate heterogamety.
In ZO-ZZ system, female is heterogametic, but the question asks correct general statement, not option (2).
Step 5: Identify occurrence.
ZO-ZZ system is found in moths and some butterflies.
Step 6: Conclusion.
Therefore, correct answer is moths and some butterflies.
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