In most of the higher unisexual animals there is one chromosomal pair which is not identical in two sexes. These are called.

Non-homologous chromosomes

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Non-identical chromosomes

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Non-compatible chromosomes

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Sex chromosomes

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Solution

The correct option is D Sex chromosomes
Sex chromosomes differ in both the sexes. For example, in case of humans, Males have XY sex chromosomes whereas females have XX sex chromosomes.
So, the correct answer is 'Sex chromosomes'.

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Sex chromosomes in a boy are identical.

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