Final Punnett Square Practice Monohybrid and Dihybrid

Two heterozgyous tall pea plants are crossed. What is the expected phenotypic outcome for the offspring?

• 100% tall

• 50% tall, 50% short

• 75% tall, 25% short

• 100% short

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The yellow pod's genotype is ______________________________________.

• heterozygous

• homozygous dominant

• homozygous recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The green pod's genotype is ________________________.

• heterozygous

• homozygous dominant

• homozygous recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If one allele for a trait is dominant and the other allele is recessive, which trait will be visible? The dominant allele or the recessive allele?

• Dominant will be visible because it is blocked by the recessive allele.

• Dominant will be visible because it hides or blocks the recessive allele.

• Recessive will be visible because it is blocked by the dominant allele.

• Recessive will be visible because it hides or blocks the dominant allele.

Tags

NGSS.HS-LS3-1

What are the possible genotypes for this cross?

• TT = 25% Tt= 50% tt=25%

• all tall

• TT= 75% tt = 25%

• Tt = 100%

Answer explanation

Correct!

For the offspring of two parents with genotypes Tt x Tt:

1/4 or 25% are TT

1/2 or 50% are Tt

1/4 or 25% are tt

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

NGSS.HS-LS3-2

Which of the following genotypes is heterozygous?

• Bb

• BB

• bb

• B

Brown eyes are dominant over blue eyes. What is the probability that the offspring will have brown eyes in this cross?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS4-3

Which genotype would be considered heterozygous?

• Hh

• Rs

• PP

• bb

Which of the following genotypes is homozygous dominant?

• aa

• Aa

• AA