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| Description: In this example, both the mother and the father are heterozygous (Aa) for a mutated gene (a) that is recessive, such as the one responsible for sickle cell disease. When both parents are carriers of a gene mutation, each child they have will have a 25% chance of inheriting the two mutated genes (aa) and therefore manifesting a recessive disease. Alt Text: The father’s alleles are capital A and lowercase a. The mother’s alleles are capital A and lowercase a. This produces 4 alleles as follows. two capital Ays, two lowercase ays, and two sets of a pair of capital A and lowercase a. Picture Stats: Views: 46 Filesize: 56.51kB Height: 514 Width: 771 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49621 |