Question

Assertion: XX-XY type of sex determination mechanism is an example of male heterogamety.

Answer 1

Assertion: XX-XY type of sex determination mechanism is an example of female heterogamety, and is found in Drosophila.
Reason: Male heterogamety is seen in months where males produce two different types of gamete.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not correct explanation of A
(c) A is true but R is false
(d) A and R are false

Answer 2

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Heterogamety means different sex gametes. Male heterogamety includes human males having XY sex chromosomes and males of some insects, such as grasshopper and bugs, having XO sex chromosomes. Female heterogamety includes females of some species of birds, fishes and insects.