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

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Q. $XO$ type of sex determination and $XY$ type of sex determination are the examples of

Principles of Inheritance and Variation

Solution:

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.