Question

XO type of sex determination and XY type of sex determination are the examples of

• A. Male heterogametic condition
• B. Female heterogametic condition
• C. Male homogametic condition
• D. Both B and C
  

Answer 1

Answer: (A)

Male heterogametic condition

In XO type and XY type sex determining mechanisms, males produce two different types of gametes, (a) either with or without X-chromosome (XO type), (b) some gametes with X-chromosome and some with Y-chromosome (XY type). Such type of sex determination mechanism is designated to be the example of male heterogamety. In both, females are homogametic and produce X type of gametes in both the cases and have XX genotype.

So, the correct answer is 'Male heterogamete'.