Dihybrid Test Cross

In a dihybrid cross

• one trait is crossed.
• two traits are crossed.
• four boxes are needed for the punnett square.
• mom's alleles are dominant.

Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?

• 9
• 2
• 3
• 6

Which of the following is the best example for a heterozygous genotype?

• AA
• Ab
• Bb
• bb

In flowers, purple color is dominant to pink and short is dominant to tall. Cross a flower that is heterozygous for both traits with another flower that is pink and tall. What is the percentage of the flowers being pink and short?

• 75%
• 25%
• 4
• 1/2

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-3

parent 1: GgBB
parent 2: ggBb
Find the gametes for parent 1.

• GB, GB, gB, gB
• gB, gb, gB, gb
• Gg, BB, GB, GB
• gg, Bb, gB, gb

R= red 
r= green
Which color is recessive?

• red
• green
• both
• brown

Which of the following identifies the gametes?

• A
• B
• C
• D

Tags

NGSS.HS-LS3-2

Which of the following identifies the phenotypes?

• A
• B
• C
• D

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which trait is always expressed when present?

• recessive
• dominant
• phenotype
• allele

How many alleles do we get from each parent for each trait?

• one
• two
• three
• four

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2