Assertion: XX-XY type of sex determination mechanism is an example of male heterogamety.
Reason: In birds, male heterogamety is seen as males produce two different types of gametes
(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