The allele for widows peak (H) is dominant for the allele for no widows peak (h). At a different gene locus, the allele for hitchhikers thumb (D) is dominant to the allele for non-hitchhikers thumb (d). A man is heterozygoous for the traits and marries a woman who has no widows peak and is heterozygous for hitchhikers thumb. What fraction of this couple's children should have no widow's peak and no hitchhiker's thumb? 1/4 1/8 1/2 3/8 3/4
A1) The allele for widows peak (H) is dominant for the allele for no widows peak (h). At a different gene locus, the allele for hitchhikers thumb (D) is dominant to the allele for non-hitchhikers thumb (d). A man is heterozygoous for the traits and marries a woman who has no widows peak and is heterozygous for hitchhikers thumb. What fraction of this couple's children should have no widow's peak and no hitchhiker's thumb?
1/4
1/8
1/2
3/8
3/4
A2)Using the forked line method, determine the phenotypic ratio of a trihybrid cross between AaBbCc X AaBBCC. What proportion of offspring will have the dominant phenotype for A, B, and C?
1/8
1/4
1/16
3/4
1/2
A3) How many different offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits when the traits behave in a dominant and recessive pattern? How many
8 genotypes; 27 phenotypes
27 genotypes; 8 phenotypes
16 genotypes; 64 phenotypes
64 genotypes; 16 phenotypes
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