6) (4 points) You are studying a gene that controls tail length in dogs. The wil
ID: 163185 • Letter: 6
Question
6) (4 points) You are studying a gene that controls tail length in dogs. The wild-type tail allele is dominant the mutant short-tail heterozy dogs. However the L allele (L frequencies? ygous What phenotypes is only 65% penetrant. You do you expect in the spring and at what 7) (8 points) You are studying body color in an African spider and have found that it is controlled by a single gene with four alleles: B (red) by B is dominant to all the other alleles, and by is recessive to all the other alleles. The b allele is dominant to b but recessive to b (a) You cross a homozygous brown spider with a homozygous red spider. Predict the genotype and phenotype of the progeny. (b) You cross a homozygous brown spider with a hom green spider. Predict the genotype and phenotype of the progeny. (c) You cross the progeny from parts (a) and (b). Predict the and phenotype of the progeny. genotype (d) You cross the non-brown progeny from part (c) to a homozygous yellow spider. Predict the genotype and phenotype of the progeny. 8 (4 points) Give a brief summary of how the male phenotype arises in human embryos.Explanation / Answer
You are studying a gene that controls length in dogs. The wild-type long tail allel(L) is dominant to the mutant short-tail (l) allel. However the L allel is only 65% pentrant. You cross two heterozygous dogs. What phenotypes do you expect in the offspring and at what frequencie
heterozygous dogs Ll x heterozygous dogs Ll
L
l
L
long tail allel(LL)
long tail allel(Ll)
l
long tail allel(Ll)
short-tail (ll)
long tail allel(LL) : short-tail (ll) =3:1
What phenotypes do you expect in the offspring and at what frequencie
long tail (LL & Ll) =65% x (3/4) =48%---------answer
remaining short tail =52%
L
l
L
long tail allel(LL)
long tail allel(Ll)
l
long tail allel(Ll)
short-tail (ll)
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