Monohybrid Cross Practice

Which trait is dominant to the other? Green pod or the yellow pod? (Look at the picture closely.)

• green pod

• yellow pod

What percentage of the offspring will have green pods?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.MS-LS3-2

The genotype of the offspring would be considered _________________________________.

• heterozygous

• homozygous dominant

• homozygous recessive

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the percentage of yellow peas?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

Tags

NGSS.HS-LS3-1

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

BB

B (top)

bb

b (side)

B (side)

b (top)

Bb

Tags

112.34.c.6.F

What percentage of peas will be green?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.MS-LS4-4

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