You have two pure-bred dog strains of Labrador retriever: Yellow (BBee) and Brow

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You have two pure-bred dog strains of Labrador retriever: Yellow (BBee) and Brown (bbEE). You friend wants to have a pure-bred puppy with black coat color. Let’s assume this set of coat 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 the pure-bred one with black color. Also, what is the frequency of the pure-bred one among the black puppies.

#2. In the rat, the gene for the pigment (P) is dominant to no pigment (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 brief explanation. B) Provide the genotype and phenotype of the F1 of a cross between homozygous black rat and an albino homozygous for cream. C) If you self-cross the F1 describe above, what kinds of rat will you see in terms of genotype and phenotype? You have two pure-bred dog strains of Labrador retriever: Yellow (BBee) and Brown (bbEE). You friend wants to have a pure-bred puppy with black coat color. Let’s assume this set of coat 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 the pure-bred one with black color. Also, what is the frequency of the pure-bred one among the black puppies.

#2. In the rat, the gene for the pigment (P) is dominant to no pigment (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 brief explanation. B) Provide the genotype and phenotype of the F1 of a cross between homozygous black rat and an albino homozygous for cream. C) If you self-cross the F1 describe above, what kinds of rat will you see in terms of genotype and phenotype? You have two pure-bred dog strains of Labrador retriever: Yellow (BBee) and Brown (bbEE). You friend wants to have a pure-bred puppy with black coat color. Let’s assume this set of coat 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 the pure-bred one with black color. Also, what is the frequency of the pure-bred one among the black puppies.

#2. In the rat, the gene for the pigment (P) is dominant to no pigment (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 brief explanation. B) Provide the genotype and phenotype of the F1 of a cross between homozygous black rat and an albino homozygous for cream. C) If you self-cross the F1 describe above, what kinds of rat will you see in terms of genotype and phenotype?

Explanation / Answer

Answer:

1).

A).

A_B_ = black

B_ee or bbee = yellow

bbE_ = brown

B).

Recessive epistasis ratio = 9:3:4

A_B_ = black = 9/16

B_ee or bbee = yellow = 4/16

bbE_ = brown = 3/16

The frequency of pure bred black among 9 progeny of black= AABB = 1/9 = 0.11

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