06BIS101S2013DomRecLect6

This is called codominance heterozygote codominance

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Unformatted text preview: ive allele (A-) and A- is only dominant and observed in the homozygous recessive (A-A- or aa) observed aa condition. 02/12/14 BIS101­001, Spring 2013—Genes and Gene Expression, R.L. Rodriguez ©2013 BIS101­001, Spring 2013—Genes and Gene Expression, R.L. Rodriguez 24 Incomplete and Co-Dominance ­ In some instances, there may be no threshold In for a particular phenotype. for ­ Instead, phenotype can be directly Instead, proportional to the amount of enzyme proportional product . This is known as incomplete dominance. dominance ­ Alternatively, both alleles of a gene may be Alternatively, active and reveal themselves in the heterozygote. This is called “codominance”. heterozygote. “codominance” 02/12/14 BIS101­001, Spring 2013—Genes and Gene Expression, R.L. Rodriguez ©2013 BIS101­001, Spring 2013—Genes and Gene Expression, R.L. Rodriguez 25 Incomplete and Co-Dominance 02/12/14 BIS101­001, Spring 2013—Genes and Gene Expression, R.L. Rodriguez ©2013 BIS101­001, Spring 2013—Genes and Gene Exp...
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