Dihybrid Crosses

Front

What is a dihybrid cross?

Back

A genetic cross between individuals that examines the inheritance of two different traits.

Front

What does the term 'homozygous' mean?

Back

An organism with two identical alleles for a particular trait (e.g., RR or rr).

Front

What does the term 'heterozygous' mean?

Back

An organism with two different alleles for a particular trait (e.g., Rr).

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What is the genotype for a pea plant homozygous for round seeds (R) and heterozygous for yellow seeds?

Back

RRYy

Front

What is the genotype for a pea plant heterozygous for round seeds (R) and homozygous recessive for green seeds (y)?

Back

Rryy

Front

In a dihybrid cross, what is the phenotypic ratio of the offspring?

Back

9:3:3:1 ratio for dominant and recessive traits.

Front

What fraction of offspring will have wrinkled, yellow seeds in a dihybrid cross?

Back

3/16

Front

What fraction of offspring will have wrinkled, green seeds in a dihybrid cross?

Back

1/16

Front

What is the law of independent assortment?

Back

The principle that alleles for different traits are distributed to gametes independently of one another.