Sex Chromosomes Determine Gender
In animal species, the autosomes, or nonsex chromosomes, are the same between the sexes. The members of each pair of autosomes are homologous. One special pair of chromosomes is called the sex chromosomes because this pair determines the sex of the individual. The sex chromosomes in the human female are XX and those in the male are XY. Because human males can produce two different types of gametes—those that contain an X and those that contain a Y—normally males determine the sex of the new individual.
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