Question

In dogs, genes A and B are required for scent.Individuals homozygous for either one or both of the nonfunctional recessive alleles are not able to smell.If a large number of matings were made between two double heterozygotes, what percentage of offspring would not be able to smell? Express your answer as a fraction (i.e. 1/10)

Answer 1

6/16 dogs will not be able to smell.

Step-by-step explanation:

Genes A and B are considered for scent smell.

Individuals homozygous for either one or both of the nonfunctional recessive alleles are not able to smell.

The final cross would be AaBb x AaBb which has outcome of;

Individual with homozygous nonfunctional recessive alleles (bold ones):

• One nonfunctional recessive alleles: Aabb, aaBB, aaBb, Aabb, aaBb (5/16)
• Two nonfunctional recessive alleles: aabb (1/16)
• All nonfunctional recessive alleles: 6/16 dogs that could not smell scents