LEQ: What is meant by co-dominance, incomplete dominance, multiple alleles, and polygenic traits? 9.12 to 9.16.

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LEQ: What is meant by co-dominance, incomplete dominance, multiple alleles, and polygenic traits? 9.12 to 9.16

Incomplete Dominance One allele is not completely dominant over the other When both alleles are present the phenotype is between the phenotypes of the parental varieties How can you tell the difference between dominance and incomplete dominance? Dominance would have 2 phenotypes Incomplete dominance has 3 phenotypes

Incomplete Dominance

Neither allele is dominant over the other allele Co-dominance When different alleles are present at the same time, both alleles are expressed Neither allele is dominant over the other allele Example: Roan Cattle

A gene that is controlled by 3 or more alleles Multiple Alleles A gene that is controlled by 3 or more alleles

Human Blood Typing

Pleiotropy The control of more than one phenotypic characteristic by a single gene

Polygenic Inheritance Traits that are controlled by 2 or more genes Characterized by having 3 or more phenotypes (a range of phenotypes)

Environmental Impact on phenotypic expression Human – expose to sun, nutrition, exercise Plant – climate, exposure to sun, water, wind