Located on the x chromosome of a cat is a gene that codes for deafness. This gene is recessive. A female cat that is heterozygous for deafness is crossed with a male cat that is not deaf. What are the genotypes and phenotypes of the offspring? Genotypes:
Phenotypes:

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Genotypes: 50% DD 50% Dd

Phenotypes: 50% normal 50% carriers

None of the cats are deaf (unless they are male, they can have a chance of getting it)

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a population changes in response to a change in the environment.