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Class 12th Biology 2015 Set1 Delhi Board Paper Solution

Question 7

Differentiate between male and female heterogamety.


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.

Females of butterfly and moth consist ZO sex chromosomes, while females of fish, reptiles and birds consist ZW sex chromosomes.