The number of pair(s) of sex chromosomes in the zygote of humans is ______.

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The number of pairs of sex chromosomes in the zygote of humans is one. Explanation: A human zygote contains 46 chromosomes arranged in 23 pairs. Out of these: • 22 pairs are autosomes. • 1 pair is the sex chromosomes (XX in females or XY in males).

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