Question

A Labrador retriever breeder needs to determine if three male pups who were born to Sadie, his black Labrador retriever, are the offspring of Sam, a yellow Labrador retriever from another breeder. Which process could the breeder use to determine if Sam is the father of the pups?

Answer 1

Answer:

Explanation:

in Labrador retriever breed of dog BB and Bb genotype determines black coat colour while bb genotype determine chocolate coat colour.

Also another pair of gene EE and Ee determines no colour while ee genotype determine yellow colour.

also note that presence of ee genotype mask the expression of black genotype BB or Bb.

in this question Sadie ( mother ) is black B_E_ X __ee ( yellow father) will produce offspring B_Ee or B_ee ( which will black or yellow )

that means if pups are of chocolate colour then sam is not father.

further

if we will back cross pups with mother there are two possibilities

(1) Sadie ( mother ) is black B_E_ X B_Ee will produce only black pups

(2) Sadie ( mother ) is black B_E_ X B_ee will produce black and yellow pups in litter.

that means if puppies produce in back cross are of chocolate colour then sam is not father.