Ch4 Flashcard2 - Dihybrid Crosses

Front

What is a dihybrid cross?

Back

A dihybrid cross is a genetic cross between individuals that differ in two traits, each represented by two alleles.

Front

In a dihybrid cross, how many combinations of alleles can be formed from two genes with two alleles each?

Back

There are 16 possible combinations of alleles in a dihybrid cross involving two genes with two alleles each.

Front

What is the phenotypic ratio expected from a dihybrid cross?

Back

The expected phenotypic ratio from a dihybrid cross is 9:3:3:1.

Front

If red flowers (R) are dominant to pink flowers (r), what is the genotype of a plant with pink flowers?

Back

The genotype of a plant with pink flowers is rr.

Front

In the cross RrTt x Rrtt, how many tall pink flowers are expected?

Back

2 out of 16 plants are expected to be tall pink flowers.

Front

In the cross YyPP x YyPp, how many yellow peas with white flowers are expected?

Back

0 out of 16 plants are expected to be yellow peas with white flowers.

Front

If gray fur (F) is dominant to white fur (f), what is the genotype of a rabbit with white fur?

Back

The genotype of a rabbit with white fur is ff.

Front

In the cross FfEe x ffEe, how many rabbits with gray fur and red eyes are expected?

Back

2 out of 16 rabbits are expected to have gray fur and red eyes.

Front

What does it mean for an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.