Monohybrid Crosses Practice Problems

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What allele combination should go in the missing box?

• AA
• Aa
• aa
• none of these

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Which of the following is homozygous dominant?

• Yy
• Y
• yy
• YY

Tags

NGSS.HS-LS3-1

Which of the following is homozygous recessive?

• Tt
• tt
• TT
• T

Complete the following monohybrid punnett by labeling the each box with the correct genotype.

a

b

c

d

Tt

Tt

tt

TT

Tags

112.34.c.6.F

In Jessica's family gene pool, brown eyes are dominant and blue eyes are recessive. Jessica is heterozygous for brown eyes and her husband is heterozygous for brown eyes. Complete the punnett to show the possible genotypes for their baby.

f

g

h

e

d

a

b

c

B (top)

Bb

bb

b (top)

b (side)

BB

B (side)

Bb

Tags

112.34.c.6.F

T - tall and t = short

In the punnett square below, what belongs in the missing square

• tt

• Tt

• Bb

• TT

Answer explanation

Correct! One parent gives a t in their gamete, and the other parent does as well, giving the genotype tt in the offspring.

Tags

NGSS.HS-LS3-1

What allele combination should go in the missing box?

• AA
• Aa
• aa
• none of these

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2