Dihybrid crosses

Front

What is a dihybrid cross?

Back

A genetic cross that examines the inheritance of two different traits, typically represented by two pairs 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

What is the purpose of a Punnett square?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What are alleles?

Back

Different forms of a gene that can exist at a specific locus on a chromosome.

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., RR or rr).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Rr).

Front

What is the phenotypic ratio expected from a dihybrid cross of two heterozygous parents?

Back

9:3:3:1.

Front

What goes in box 3 of a Punnett square for a dihybrid cross?

Back

Aabb

Front

What goes in box 15 of a Punnett square for a dihybrid cross?

Back

aabb