Dihybrid Crosses

Front

What is a dihybrid cross?

Back

A genetic cross that examines the inheritance of two different traits, typically involving two pairs of contrasting traits.

Front

What is the purpose of a Punnett square?

Back

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

Front

What does the term 'homozygous' mean?

Back

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

Front

What does the term '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?

Back

9:3:3:1 ratio of phenotypes.

Front

What is the genotype for round seeds in pea plants?

Back

R (dominant allele for round seeds).

Front

What is the genotype for wrinkled seeds in pea plants?

Back

r (recessive allele for wrinkled seeds).

Front

What is the genotype for yellow seeds in pea plants?

Back

Y (dominant allele for yellow seeds).

Front

What is the genotype for green seeds in pea plants?

Back

y (recessive allele for green seeds).

Front

If a plant has the genotype RrYy, what are the possible gametes it can produce?

Back

RY, Ry, rY, ry.