The number of chromosomes in the male and the female are unequal in the case of

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fowls

grasshoppers

rabbits

humans

answer is B.

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Detailed Solution

The type of sex determination in grasshoppers is XO-XX. Besides autosomes, females have two X chromosomes while males have only one allosome. So, the number of chromosomes in the male is one less than in the female.

Males and females have equal number of chromosomes in XX-XY (mammals, e.g., rabbits and humans) and ZW-ZZ (e.g., fowls) types of sex determination because both male and female have two allosomes, besides autosomes.

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