Free Printable Dihybrid Cross Practice

Worksheets

Dihybrid Cross Practice

Total questions: 15

Worksheet time: 32mins

Name

Class

Date

What goes in box 3

Aabb

AABB

AAbb

aaBb

What goes in box 15

aabb

AABB

aaBB

AAbb

Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?

25%

50%

100%

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

RRyy

RrYy

Rryy

Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?

In a dihybrid cross

one trait is crossed.

two traits are crossed.

four boxes are needed for the punnett square.

mom's alleles are dominant.

Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

9/16

3/16

1/16

16/16

Based off this punnett square, what fraction of the offspring will have wrinkled, green seeds?

9/16

3/16

1/16

16/16

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

RrYy

RRyy

RRYy

rryy

10.

Which of the following genotypes is heterozygous?

11.

Which of the following genotypes is homozygous dominant?

12.

Match the following

homozygous dominant

heterozygous

homozygous recessive

13.

Match the following

phenotype examples

green round, yellow wrinkled

genotype examples

GgRr, GGRr, ggrr

phenotype definition

physical or "expressed" traits

genotype definition

allele (letter) combinations

14.

If Green (G) peas are dominant to yellow peas (g) and Round peas (R) are dominant to wrinkled seeds (r), which of the following shows the genotype for a pea plant that is homozygous recessive for yellow, and heterozygous for round?

GgRr

GGRr

GGrr

ggRr

15.

If Green (G) peas are dominant to yellow peas (g) and Round peas (R) are dominant to wrinkled seeds (r), which of the following shows the genotype for a pea plant that is homozygous dominant for green, and homozygous recessive for wrinkled?