Question

Polydactyl cats inherit a dominant gene from at least one of their parents, which results in them having six toes. A heterozygous polydactyl cat is mated with a non-polydactyl cat that is homozygous recessive. What are the possible genotypes and phenotypes of their children and the percent chance for each?

A) Genotype: 50% Heterozygous, 50% Homozygous Recessive; Phenotype: 50% Polydactyl, 50% Non-Polydactyl
B) Genotype: 100% Heterozygous; Phenotype: 100% Polydactyl
C) Genotype: 100% Homozygous Recessive; Phenotype: 100% Non-Polydactyl
D) Genotype: 75% Heterozygous, 25% Homozygous Recessive; Phenotype: 75% Polydactyl, 25% Non-Polydactyl

Answer 1

A) Genotype: 50% Heterozygous, 50% Homozygous Recessive; Phenotype: 50% Polydactyl, 50% Non-Polydactyl. The possible genotypes and phenotypes of the offspring are 50% heterozygous (polydactyl) and 50% homozygous recessive (non-polydactyl). The phenotypes will also be 50% polydactyl and 50% non-polydactyl.

Step-by-step explanation:

The possible genotypes and phenotypes of the offspring from a mating between a heterozygous polydactyl cat and a homozygous recessive non-polydactyl cat are:

Genotypes:

• 50% Heterozygous (Polydactyl): Pp
• 50% Homozygous Recessive (Non-Polydactyl): pp

Phenotypes:

• 50% Polydactyl
• 50% Non-Polydactyl

The percentage chance for each genotype/phenotype is 50%.