Monday, October 18, 2010

Multiple Alleles

When there are more than 2 choices of allele at one gene locus, there are more phenotypes possible.  This pattern of inheritance is known as multiple alleles because where we have only seen 2 options of alleles (dominant and recessive or 2 different dominants), now we have more!

Human blood type is the classic example of multiple alleles that we studied in class.  There are 2 dominant alleles and 1 recessive making for 6 possible genotypes and 4 possible phenotypes.

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