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Question: Answered & Verified by Expert
Assertion : XX-XY type of sex determination mechanism is an example of female heterogamety and is found in Drosophila.
Reason : Male heterogamety is seen in moths where males produce two different types of gamete.
BiologyPrinciples of Inheritance and VariationAIIMSAIIMS 2017
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
2713 Upvotes Verified Answer
The correct answer is: If both assertion and reason are false.
Chromosomal determination of sex is based on heterogamety or occurrence of two types of gamete in one of the two sexes. In Drosophila XX-XY type of sex determination is found where males are heterogametic. In moths, ZO-ZZ type of sex determination occur where males are homogametic.

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