Punnett Squares and Probability

What are the parents' genotypes?

• A and a

• AA and aa

• Aa and Aa

• AA and Aa

Tags

NGSS.HS-LS3-1

A = healthy; a = sickle cell anemia

What is the probability of an offspring having the genotype aa?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

A = healthy; a = sickle cell anemia

What is the probability of an offspring being healthy?

• 100%

• 50%

• 75%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

N = blue nose; n = green nose

What are the parents' genotypes?

• NN and Nn

• nn and NN

• Nn and Nn

• impossible to tell

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

N = blue nose; n = green nose

What is the probability of an offspring having a green nose?

• 100%

• 50%

• 0%

• impossible to tell

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Y = yellow flower petals; y = white flower petals

What is the probability of an offspring having a genotype that neither parent has?

• 25%

• 0%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

M = Marfan syndrome; m = healthy

What is the probability of an offspring having Marfan syndrome?

• 75%

• 50%

• 25%

• impossible to tell

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

On a separate piece of paper, fill in this Punnett square.

In this cross, what genotypes can appear in the offspring?

• all except JJ

• all except Jj

• all except jj

• impossible to tell

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

On a separate piece of paper, fill in this Punnett square.

In this cross, what is the probability of an offspring having the dominant phenotype?

• 25%

• 50%

• 75%

• impossible to tell

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

On a separate piece of paper, fill in this Punnett square.

In this cross, what is the probability of an offspring being heterozygous?

• 0%

• 100%

• 50%

• impossible to tell

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3