Dihybrid Cross Practice

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 does the term 'homozygous' mean?

Back

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

Front

What does the term 'heterozygous' mean?

Back

An organism with two different alleles for a specific 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 phenotypic ratio of a dihybrid cross between two heterozygous parents (RrYy x RrYy)?

Back

9:3:3:1.

Front

What is the genotype for a plant that is homozygous dominant for round seeds and heterozygous for yellow seeds?

Back

RRYy.

Front

What is the expected percentage of offspring with round seeds from a cross of RR and rr?

Back

100%.

Front

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

Back

RY, Ry, rY, ry.

Front

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

Back

1 RRYY : 2 RRYy : 2 RrYY : 4 RrYy : 1 RRyy : 1 rrYY : 2 rrYy : 1 rryy.

Front

What is the significance of the F1 generation in genetics?

Back

The first filial generation, which is the result of a cross between two parental (P) generations.