Punnett Square Practice Problems

A male rabbit with black fur is crossed with a female rabbit with brown fur. The fur color of the offspring is shown in the chart.

What is the genotype of the male rabbit?

• BB

• Bb

• bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following alleles is homozygous (purebred) recessive?

• Tt

• tt

• TT

• t

What are the possible genotypes for this cross?

• TT = 25% Tt= 50% tt=25%

• all tall

• TT= 75% tt = 25%

• Tt = 100%

Tags

NGSS.HS-LS3-3

What are the possible genotypes of the offspring? (A-Brown hair; a-blond hair)

• AA, Aa, aa

• AA only

• Aa only

• aa only

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What genotype would go in box 1?

• BB

• Bb

• bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the missing allele?

• a

• A

• AA

• aa

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?

• none

• 3/4

• 1/2

• all

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What chance does the offspring have of showing a recessive trait?

• 50%

• 75%

• 100%

• 25%

Tags

NGSS.HS-LS3-3

What phenotype would result from crossing a homozygous dominant purple-flowered pea plant with a homozygous recessive white-flowered pea plant?

• Pp

• Purple

• White

• PP and pp

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2