Question

1. A brown mink crossed with a silver-blue mink produced all brown offspring. When these F1 were crossed among themselves, they produced forty-seven brown animals and fifteen silver-blue animals. What are the genotypes of the parentals and the F1s

Answer 1

The correct answer is -

Parental - BB and bb

F1

Genotypes: 100% Bb

F2

Genotypes: ¼ BB, ½ Bb, ¼ bb

Step-by-step explanation:

It is given that a cross between a brown and a silver-blue mink produces all brown offspring and it is only possible if brown is dominant over silver blue in true breed cross, assume brown trait is represented by B and silver-blue is b then parents will be

BB and bb

B B

b Bb Bb

b Bb Bb

Cross between F1 individuals: Bb cross Bb

gametes : B, b and B, b

B b

B BB Bb

b Bb bb

the genotype of F2 : 1:2:1 = ¼ BB, ½ Bb, ¼ bb