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Published byPaula Patrick Modified over 9 years ago
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Complex Methods of Inheritance
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Incomplete Dominance No gene is completely dominant resulting in a third phenotype. The third phenotype is usually a mixture of the dominant and recessive trait Example: Pink snap dragon
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Codominance Both alleles are dominant, therefore both traits are visible resulting in a third, mixed phenotype Example: Speckled Chicken
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Sex Linked Alleles are found on either the X or Y chromosome. Examples: Colorblindness, Ricketts, and Hemophillia in Humans – Calico cats – Eye color in fruit flies
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Multiple Alleles One allele codes for more than one trait Example Blood types
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Polygenic Inheritance Expressed traits are carried more than one gene Example: Hair color, Height, Skin Color
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Epistasis The trait is influenced by other alleles If a dominant B is present, then the mouse will be black unless there is a homzygous c then the mouse will be white. Two homozygous recessive b’s with a dominant C trait yield a brown coated mouse.
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