Question

In rabbits, black fur is dominant to white fur. If you cross a BB male with a Bb female, what are the possible genotypes and phenotypes of the offspring? What is the percent chance for each type?

Answer 1

Answer:

50% chance for each type.

Explanation:

The Law of dominance states that a trait is represented by 2 contrasting factors of a gene in a heterozygous individual while the homozygous individual carries 2 copies of the same factors. Thus, the genotype of the heterozygous rabbit will be Bb and the homozygous recessive rabbit will be BB. The Law of segregation states that the 2 factors for a trait, present together in a heterozygous individual (Bb), do not get mixed and are delivered and separated by singly during the process of gametogenesis.

Thus, the heterozygous individual will produce 2 types of gametes: 50% gametes with “B” and 50% with “b”. The homozygous recessive individual will make all gametes with the B allele only. Fertilization of gamete with B allele from a recessive parent with that carrying B allele from the heterozygous parent will produce homozygous recessive progeny (BB) not “Bb”.