Monohybrid and Dihybrid Cross Practice

Based on the results in the monohybrid punnett square, what is the percent chance of having a child with blue eyes?

• 75%

• 50%

• 25%

• 0%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Based on the results in the monohybrid punnett square, what is the genotypic ratio?

• 1:2:1

• 0:2:2

• 0:0:4

• none

Tags

NGSS.HS-LS3-2

What is the term for a cross that involves just one trait, such as pod shape?

• test cross

• dihybrid cross

• monohybrid cross

• homozygous cross

What are the possible genotypes for this cross?

• TT=25%, Tt=50%, tt=25%

• all tall

• TT=75%, tt=25%

• Tt=100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Based on the results in the monohybrid punnett, what is the percent chance of having a child with blue eyes?

• 75%

• 50%

• 25%

• 0%

Tags

112.34.c.6.F

What are the phenotype percentages of the offspring?

• 50 % Brown fur and 50% White fur

• 25 % Brown fur and 75% White fur

• 75 % Brown fur and 25% White fur

• 0% Brown fur and 100% White fur

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the phenotypic ratio for the monohybrid cross between blue and brown eyes?

• 3:1

• 2:2

• 0:2:1

• 1:2:1

In laboratory mice, gray coat color (G) is dominant over albino coat color (g). Cross a female Gg with a male gg.

c

d

b

a

G

g (top)

g (left)

g

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In a monohybrid cross between two heterozygous pea plants (Tt), what is the probability of producing a pea plant with tall stems (T-)? Scarlett and Kai are experimenting in their biology class to understand how traits are passed in pea plants. (T is dominant for tall stems, t is recessive for short stems.)

• 25%

• 50%

• 75%

• 100%

Answer explanation

The probability of producing a pea plant with tall stems (T-) in a monohybrid cross between two heterozygous pea plants is 75% because there is a 3/4 chance of getting the dominant allele for tall stems (T) in the offspring.

Tags

DOK Level 2: Skill/Concept

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.

e

f

g

d

c

a

b

B (top)

b (side)

BB

bb

Bb

b (top)

B (side)

Tags

112.34.c.6.F