Inheritance

Front

What is a recessive allele?

Back

An allele whose trait only shows up when no dominant allele is present.

Front

What percent of offspring will have the recessive trait if both parents are heterozygous?

Back

25%.

Front

What does homozygous mean?

Back

When an individual has two sets of the same allele.

Front

In a cross between a heterozygous dog (Bb) and a homozygous recessive dog (bb), how many puppies will have black fur if they have a litter of 12?

Back

6 puppies.

Front

In a cross between two heterozygous cats (Ss), how many kittens will have no stripes if they have a litter of 8?

Back

2 kittens.

Front

What is a dominant allele?

Back

An allele that expresses its trait even when only one copy is present.

Front

What is the genotype of a homozygous dominant individual?

Back

Two dominant alleles (e.g., AA).

Front

What is the phenotype of an individual with genotype Bb?

Back

The phenotype will depend on the dominance of the alleles; in this case, it will show the dominant trait.

Front

If a trait is controlled by a single gene with two alleles, what are the possible genotypes?

Back

Homozygous dominant (AA), homozygous recessive (aa), and heterozygous (Aa).

Front

What is the probability of getting a homozygous recessive offspring from a cross between two heterozygous parents?

Back

25%.