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Q.

In which of the following pairs, one sex has only one type of sex chromosome and another has two sex chromosomes?

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a

Grasshoppers and cockroaches

b

Fishes and birds

c

Honey bees and ants

d

Fruit fly and humans

answer is A.

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Detailed Solution

In grasshoppers, and cockroaches, there is only one type of sex chromosome, the X. Females are XX. Males have only one sex chromosome XO

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