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Line 2:
Line 2: − *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>+
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Educational Ministries, Inc. 1998</ref>
Educational Ministries, Inc. 1998</ref>
Human cells normally 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>
==References==
==References==