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Â· just now. Report Abuse. D! The females have two copies of the X chromosome whereas the male have one X and one Y. Technically, all humans have 23 pairs but the last pair are the sex chromosomes and differ for gender. Someone To Help Â· 3 years ago. Thumbs up. 0.
In this case, females are XX, while males are determined by a single X chromosome (and thus the O, read as nothing, because there is no chromosome analogous to the Y). So some of the gametes produced by males have an X, while others carry no sex chromosome at all.