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:

draw a punnett square to help you

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)

Explanation:

This gene is an X linked recessive trait, thus for it to be expressed in the females, it has to be in the homozygous recessive form (both X chromosomes will carry this trait dd). For males, only one copy which is in the recessive condition is needed for it to be expressed. Thus, a cross between

female           male

XDXd     x      XDY

                     XD             Y

XD              XDXD        XDY

Xd              XDXd         XdY

the offspring phenotype: normal females: 1/2

                                         normal male: 1/4

                                         deaf male: 1/4

Explanation:

This gene is an X linked recessive trait, thus for it to be expressed in the females, it has to be in the homozygous recessive form (both X chromosomes will carry this trait dd). For males, only one copy which is in the recessive condition is needed for it to be expressed. Thus, a cross between

female           male

XDXd     x      XDY

                     XD             Y

XD              XDXD        XDY

Xd              XDXd         XdY

the offspring phenotype: normal females: 1/2

                                         normal male: 1/4

                                         deaf male: 1/4

In the screenshot

Explanation:

If that's the right assignment I'll give you the pdf

In the screenshot

Explanation:

If that's the right assignment I'll give you the pdf

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