#1. 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. Letâs assume this set of coat color variations follows recessive epistasis with the allele âeeâ 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?
#1. 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. Letâs assume this set of coat color variations follows recessive epistasis with the allele âeeâ 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?
Related textbook solutions
Related questions
In rats, several independently assorting autosomal genes affectcoat color. Gene A controls the distribution of yellow pigment inhair, and gene B causes black pigmentation. The two genes interactas follows: AâBâ (gray), Aâbb (yellow), aaBâ (black), and aabb(cream). These genotypes are only expressed in the presence of thedominant allele of a third gene, C; rats with genotype cc arealbino.
a. Deduce the genotype of each albino mice, to the extent thatis possible, in the following table. Explain your answers.
True-breeding parents | F1 | F2 offspring |
Gray x albino-1 | All gray | 3/4 gray : 1/4 albino |
Gray x albino-2 | All gray | 9/16 gray : 3/16 yellow : 4/16 albino |
b. Deduce the genotype and phenotype of each parent in thefollowing table. Explain your answers.
Parents | Numbers of offspring |
Cross 1 | 135 gray, 83 albino, 47 yellow, 44 black, 16 cream |
Cross 2 | 103 albino, 74 black, 25 cream |
c. A gray-colored rat is mated with one that is yellow. Theoffspring include an albino rat and a cream-colored rat. Diagramthis cross. Be sure to include the Punnett square and thephenotypic ratio in the offspring.
