A dog breeder has a female black Labrador Retriever that was one of a litter of...
A dog breeder has a female black Labrador Retriever that was one of a litter of puppies from a mating of a yellow lab with a brown lab. If he breeds this dog with a black stud that is also from a mating between yellow lab and a brown lab, what phenotypes and ratio which you expect among the puppies.
Homework Answers
Black color is dominant over yellow
here both black female if heterozygous for color Bb (black) mate with black color male (Bb)
Bb. X Bb
I
B. b. B b. ( Gamete formation)
I
BB Bb. bB bb (F1 generation have 3 black and 1 is yellow)
So genotype ratio is 1:2:1 (1 BB, 2Bb,1bb)
Phenotype ratio is 3:1 ( black: yellow)
Hope it's clear..thanks
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