Which one of the following conditions correctly describes the manner of determining the sex in the given…

Which one of the following conditions correctly describes the manner of determining the sex in the given example?
  1. XO type of sex chromosomes determine male sex in grasshopper
  2. XO condition in humans as found in Turner syndrome, determines female sex
  3. Homozygous sex chromosomes (XX) produce male in Drosophila
  4. Homozygous sex chromosomes determine female sex in birds

Solution

Grasshopper is an example of XO type of sex determination in which the males have only one $\mathrm{X}$-chromosome besides the autosomes, whereas females have a pair of X-chromosomes.

Asked in: NEET 2011 (Screening)

Practice more Principles of Inheritance and Variation questions on Aicharya