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NEETZoologyPrinciples of Inheritance and Variation

In which of the following pairs of organisms do the males possess a lower total number of chromosomes than the females, albeit due to entirely different genetic mechanisms?

Options

  1. ADrosophila and Human
  2. BGrasshopper and Honey bee
  3. CBirds and Grasshopper
  4. DHoney bee and Drosophila

Correct answer

B. Grasshopper and Honey bee

Step-by-step solution

In grasshoppers (XX-XO type of sex determination), females have a pair of X chromosomes (XX) while males have only one X chromosome (XO). Thus, male grasshoppers have one chromosome less than females. In honey bees, sex determination is haplo-diploid. Females are diploid and develop from fertilized eggs, whereas males (drones) are haploid and develop parthenogenetically from unfertilized eggs. Thus, males have half the number of chromosomes compared to females. In Drosophila and humans (XX-XY type), both males and

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