help 8. Red-green color blindness is an X-linked recessive trait in h umans. Pol

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8. Red-green color blindness is an X-linked recessive trait in h umans. Polydactyly inant trait. Martha has 10 fingers and toes and standard color vision. Her mother is wildtype in all respects and her father is colorblind and has polydactyly. Bill is color blind and polydactylous. His mother had standard color vision and 10 fingers and toes. A. What are the genotypes of Bill and Martha? If Bill and Martha reproduce, what are the proportions of genotypes and phenotypes that may be found in their potential offspring? B.

Explanation / Answer

8) A: Genotype of Bill and Martha:

For polydactyly, Bill must be D ( D denotes the dominant polydactyly allele). Because his mother has normal fingers (dd),he cannot be homozygous DD.Martha, with normal fingers, must be dd.

Genotypes of Martha and Bill:

If Martha (dd,X+Xc) marries Bill ( Dd,XcY), then we can predict the types and probability ratios of children they could produce.

B)

If they marry and reproduce they will produce a phenotype and genotype proportion of ;

Combining both traits, then:

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