Applying Mendel’s Principles WB Quiz

In certain breeds of dogs, deafness is due to a recessive allele (d) of a particular gene, and normal hearing is due to its dominant allele (D).  What percentage of the offspring of a normal heterozygous (Dd) dog and a deaf dog (dd) would be expected to have normal hearing?

In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive.  What are the possible combinations of genes in the offspring of two red-eyed heterozygous flies (Rr)?

Fur color in cats is controlled by an autosomal gene that can occur in the dominant form, (B), or the recessive form, (b).  The length of the cat’s fur is controlled by another autosomal gene which occurs in the dominant form, (S), or the recessive form, (s).  The table below shows the traits for these allele codes.

The following genotypes were found in a male cat and a female cat.

BbSs (male)                          bbSS (female)

Which one of the following choices is true of the phenotype of offspring from these parents?

In carrier pigeons there is a rare inherited condition that causes the death of the chicks before hatching.  In order for this disease to be passed from generation to generation there must be parent birds that

A trait for flower color shows incomplete dominance, where heterozygous individuals have pink flowers.  If a homozygous dominant individual were crossed with a heterozygous individual, what percentage of their offspring would exhibit pink flowers?

The Punnett square below shows a cross between two rabbits.  Black fur (B) is dominant to brown fur (b).

Match the genotype and phenotype of each offspring with it’s corresponding box number.

A heterozygous individual (Aa) was crossed with another heterozygous individual (Aa).  Match the following percentages with their corresponding genotypes.

The Punnett square below shows a cross between two rabbits.  Black fur (B) is dominant to brown fur (b).

If individuals from box 2 and box 4 were crossed, what would be the genotypes of the offspring?

In humans, having freckles (F) is dominant to not having freckles (f).  Having a cleft chin (C) is also dominant to not having a cleft chin (c).   Which statement is true of the offspring of a cross between parents that are both heterozygous for both traits (FfCc)?  (Dihybrid cross)

In snap peas, yellow flowers (Y) are dominant to white flowers (y).

In the cross YY x Yy, what would be the genotypic ratio of the F1 generation?

Match the following definitions with their corresponding term.