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Download Ch. 11.3 Other Patterns of Inheritance
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* 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 Phenotype Allele Pattern of Inheritance Dark Gray Coat C Dominant to all other alleles Chinchilla cch Dominant to Himalayan and white Himalayan ch Dominant to white White c Recessive • 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