Complete Dominance

In pea plants, round seeds (R) are dominant to wrinkled seeds (r). Which of the following represents the genotype of a pea plant that is heterozygous?

• RR

• round

• Rr

• wrinkled

• rr

Tags

NGSS.HS-LS3-1

In pea plants, round seeds (R) are dominant to wrinkled seeds (r). Which of the following represents the genotype of a pea plant that is homozygous dominant?

• RR

• round

• Rr

• wrinkled

• rr

Tags

NGSS.HS-LS3-1

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, the offspring in box 4 would:

• be white.

• be heterozygous.

• be gray.

• be homozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, how many offspring would be black?

• 0

• 1

• 2

• 3

• 4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In many plants, tall (T) is dominant to short (t). In the cross shown here, the genotype of both parents is:

• tall.

• short.

• homozygous.

• heterozygous.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In humans, having freckles (F) is dominant to not having freckles (f). What is the percent chance that a married couple with no freckles will give birth to a child who has freckles?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In humans, having freckles (F) is dominant to not having freckles (f).

Two people with freckles get married and give birth to three children. Two of the kids have freckles and one does not.

Both parents must have which genotype?

• FF

• Ff

• ff

Tags

NGSS.HS-LS3-1

If black fur is dominant and white fur is recessive, what genotype would an organism with white fur have?

• FF

• Ff

• ff

Tags

NGSS.HS-LS3-1

Cody crosses a plant producing wrinkled peas with a plant producing smooth peas. Weeks later, he discovers that all the offspring plants have smooth peas. Cody drew the Punnett square above to show the genotypes of the offspring plants. Which is the dominant phenotype in the pea plants used in Cody’s experiment?

• smooth

• wrinkled

• RR

• Rr

Tags

NGSS.HS-LS3-1

Cody crosses a plant producing wrinkled peas with a plant producing smooth peas. Weeks later, he discovers that all the offspring plants have smooth peas. Cody drew the Punnett square above to show the genotypes of the offspring plants. What were the genotypes of the parent plants?

• RR and rr

• Rr and Rr

• RR and Rr

• Rr and rr

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2