Labrador retriever dogs have three coat colors: black, brown
and yellow. The color of the
pigment deposited...
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Biology
Labrador retriever dogs have three coat colors: black, brownand yellow. The color of thepigment deposited in the hairs is determined by agene with two alleles (B or b). TheB allele codes for blackpigment and is dominant to the ballele which codes for brown. Anothergene with two alleles (E or e)determines if the pigment created will bedeposited into the hairs. If both copies(ee) are recessive, nopigment will be deposited (regardless of which isproduced), and the dog will be yellow.
What do you call the type of relationship thatthe E gene has with the B gene? (0.5 points)
You cross together two Labradors with genotypesB/b; E/e.
What is the phenotype of the B/b; E/egenotype? (1 point)
Determine the phenotypic ratio for the F1generation. Show your Punnett square! (2 points)
What phenotypic ratios do you get if you crossthe following types of Labradors (show your Punnett square as well;6 points):
B/b; E/e X b/b; e/e
B/B; E/E X B/B; E/e
b/b; E/E X B/B; e/e
Answer & Explanation
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3.7 Ratings (633 Votes)
a epistasis E is the epistatic locus when the genotype at the E locus is ee then phenotype is yellow regardless of the genotype at the the B locus so this is an example
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