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NEET2017ZoologyPrinciples of Inheritance and VariationActual

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.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

D. If both assertion and reason are false.

Step-by-step solution

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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