When there is a single chromosome present in a haploid cell the why do we say that there are two chromosomes in the gamete cells called X and Y in males and X and X in females ?
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Solution
The all humans are diploid. So we should have 2 sex chromosome.
That is gamete cell is also diploid cell, which formed by the fusion of 2 haploid cells from mother and father. Means , half sex chromosomes from the sperm (can be X or Y) and half chromosomes from ova (X) fuse to form diploid gamete.