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NEETZoologyPrinciples of Inheritance and Variation

Select the incorrect statement with respect to the mechanism of sex determination in birds.

Options

  1. AIt represents a mechanism of female heterogamety.
  2. BThe total number of chromosomes is the same in both males and females.
  3. CFemales produce two different types of ova in terms of sex chromosomes.
  4. DMales produce two different types of sperms, half with a Z chromosome and half with a W chromosome.

Correct answer

D. Males produce two different types of sperms, half with a Z chromosome and half with a W chromosome.

Step-by-step solution

In birds, the mechanism of sex determination is of the ZZ-ZW type. Females are heterogametic (ZW) and produce two different types of ova: 50% carrying a Z chromosome and 50% carrying a W chromosome. Males are homogametic (ZZ) and produce only one type of sperm, all of which carry a Z chromosome. Therefore, the statement that males produce two different types of sperms is incorrect. Both males and females have the same total number of chromosomes, as they both possess an equal number of autosomes and two sex chromos

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