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30 Jun 2019
Labrador retriever dogs have two genes that affect coat color. One gene, the B locus, codes for the intensity
of eumelanin production in the dogâs coat. It has two alleles that produce either a black pigment (B) or a
brown pigment (b). Another gene, the E gene, is epistatic to the B gene. The dominant E allele causes
eumelanin to be deposited along the length of the dogâs hair shafts. The recessive e allele blocks the
deposition of eumelanin in the hair, so only the yellow producing phaeomelanin pigment is deposited,
resulting in yellow dogs. If you cross parents with the following genotypes, Bbee x bbEe, what phenotypic
ratio do you expect in their offspring?
Labrador retriever dogs have two genes that affect coat color. One gene, the B locus, codes for the intensity
of eumelanin production in the dogâs coat. It has two alleles that produce either a black pigment (B) or a
brown pigment (b). Another gene, the E gene, is epistatic to the B gene. The dominant E allele causes
eumelanin to be deposited along the length of the dogâs hair shafts. The recessive e allele blocks the
deposition of eumelanin in the hair, so only the yellow producing phaeomelanin pigment is deposited,
resulting in yellow dogs. If you cross parents with the following genotypes, Bbee x bbEe, what phenotypic
ratio do you expect in their offspring?
Bunny GreenfelderLv2
3 Jul 2019
