*Human cells contain two sex chromosomes. If you're female, you have two X chromosomes, and if you're male, you have an X and a Y chromosome. <ref> [http://www.dummies.com/WileyCDA/DummiesArticle/id-4097,subcat-MATH.html Genetics: Examining the Basics of Chromosomes] </ref>
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*Human cells contain two sex chromosomes. Females have two X chromosomes, and males have an X and a Y chromosome. <ref> [http://www.dummies.com/WileyCDA/DummiesArticle/id-4097,subcat-MATH.html Genetics: Examining the Basics of Chromosomes] </ref>