Punnett Squares and Probability

A student views an incomplete Punnett square.

Which question can the student answer using the Punnett square?

• What alleles did the father contribute?

• What trait does the letter B represent?

• How many mutations appear in the offspring?

• How many female offspring are homozygous?

Tags

NGSS.HS-LS3-1

What is the probability of an offspring of hamster with the genotype Aa resulting when parents with genotypes Aa and Aa are crossed?

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-3

Sickle cell anemia is an inherited disease that affects the shape of red blood cells. It is a recessive trait that requires a homozygous recessive genetic arrangement in order to be expressed. If two parents with sickle cell anemia have a child, what are the odds that their offspring will inherit the disease?

• 100%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Unattached earlobes are controlled by a dominant allele, E, while attached earlobes are controlled by a recessive allele, e. If a homozygous dominant individual for unattached earlobes mates with a heterozygous dominant individual for unattached earlobes, which statement is correct about their possible offspring?

• Their offspring have a 100% chance of having unattached earlobes.

• Their offspring have a 0% chance of having unattached earlobes.

• Their offspring have a 25% chance of having attached earlobes.

• Their offspring have a 75% chance of having attached earlobes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

How many possible allele combinations can come from the gametes produced by an organism with a genotype of AaBB?

• 1

• 2

• 4

• 8