Say What!?!?. One allele is not completely dominant over the other. - heterozygous phenotype always intermediate Ex. A cross between a recessive white.

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Presentation transcript:

Say What!?!?

One allele is not completely dominant over the other. - heterozygous phenotype always intermediate Ex. A cross between a recessive white flowered four o’ clock plant (rr) and a homozygous dominant red flowered four o’ clock plant (RR).

Phenotypes of both alleles are completely expressed. Ex. A cross between a white feathered chicken (bb) and a black feathered male chicken (BB).

A gene that has a trait with two or more alleles. -Many genes exist this way (blood typing) Ex. Rabbit coat color PhenotypeAllelePattern of Inheritance Dark Gray CoatCDominant to all other alleles Chinchillac ch Dominant to Himalayan and white Himalayanchch Dominant to white WhitecRecessive

Traits controlled by more than two genes. Ex. Skin color, height

Environment can affect the expression of genes and influence genetically determined traits. Ex.Temperature dependent sex determination in reptiles