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#1. You have two pure-bred dog strains of Labrador retriever: Yellow (BBee) and Brown (bbEE). You...

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Biology

#1. You have two pure-bred dog strains of Labrador retriever:Yellow (BBee) and Brown (bbEE). You friend wants to have apure-bred puppy with black coat color. Let’s assume this set ofcoat color variations follows recessive epistasis with the allele‘ee’ masking B or b.

A) provide breeding schemes
B) after breeding experiments, provide a scheme of identifying thepure-bred one with black

color. Also, what is the frequency of the pure-bred one amongthe black puppies.

#2. In the rat, the gene for the pigment (P) is dominant to nopigment (p). The gene for black

(B) is dominant to the gene for cream (b). If a pigment gene (P)is absent, genes B and b are inoperative or non-functional,resulting in albino phenotype.

A) What kind of inheritance patterns is this? Provide a briefexplanation.
B) Provide the genotype and phenotype of the F1 of a cross betweenhomozygous black rat

and an albino homozygous for cream.

C) If you self-cross the F1 describe above, what kinds of ratwill you see in terms of genotype and phenotype?

Answer & Explanation Solved by verified expert
4.3 Ratings (530 Votes)
A cross between Pure bred Yellow labrador BBee and Brown labrodor bbEE will result in mix Bred Black labrador BbEe This bred if back crossed with Pure bred Yellow labrador will result in pure bred Black Labrador with BBEe genotype with 25    See Answer
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