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| Description: The 23 pairs of human chromosomes include 22 pairs of autosomes and one pair of sex chromosomes (X and Y). Males have an X and a Y chromosome. Females have two X chromosomes (one is automatically inactivated—X-chromosome inactivation—and becomes a Barr body). Whether the sperm that will fertilize an egg is carrying an X or a Y chromosome will determine the gender of the zygote. An egg will only have one X chromosome under normal circumstances. Picture Stats: Views: 208 Filesize: 402.01kB Height: 900 Width: 942 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40525 |