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NEETZoologyPrinciples of Inheritance and Variation

The diploid somatic chromosome number in a female bird of a particular species is 78 . What will be the exact chromosome composition of the ova produced by this bird?

Options

  1. A39 A + Z and 39 A + W
  2. B38 A + X and 38 A + Y
  3. C76 A + Z and 76 A + W
  4. D38 A + Z and 38 A + W

Correct answer

D. 38 A + Z and 38 A + W

Step-by-step solution

Birds exhibit the ZZ-ZW type of sex determination, where females are heterogametic (possessing one Z and one W chromosome) and males are homogametic (ZZ). The given diploid chromosome number ( 2n ) of the female bird is 78 . This total includes both autosomes and sex chromosomes. Number of autosomes = Total chromosomes - Sex chromosomes = 78 - 2 = 76 autosomes ( 76 A ). During meiosis, the chromosome number is halved to form haploid gametes (ova). The 76 autosomes segregate equally, resulting in 38 autosomes ( 38 A

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