Dihybrid Cross Lesson

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.

This is an example of a ______________.

• phenotype

• genotype

• xenotype

• base pairs

Tags

NGSS.HS-LS3-1

Select the following options that represent a genotype.

• Rr

• Round peas

• Smooth peas

• rr

What do the letters on the inside of the punnett square stand for?

• chromosome

• Allele combination in the offspring

• allele of the gametes

• phenotype

In a dihybrid Punnett square, how many different allele combinations can result from the gametes of each parent?

• 4

• 8

• 16

• 5

In rabbits, white fur (W) is dominant to black (w), and long ears (E) are dominant to short ears (e). A breeder mates two rabbits that are heterozygous (WwEe) for both traits. What is the chance that the offspring will be black with long ears

• 1/16

• 3/16

• 4/16

• 8/16

• 9/16

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In tomato plants, tall vines (T) are dominant to dwarf vines (t), and red fruit (R) is dominant to yellow fruit (r). A farmer mates a homozygous tall, red tomato plant (TTRR) with a heterozygous tall, red tomato plant (TtRr). What is the percent chance that the offspring will be dwarf plants with yellow fruit?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

This image is an example of a ________ cross.

• Monohybrid

• Dihybrid

• Purebred

• Heterozygous

What goes in box 1?

• AABb

• AABB

• aabb

• AaBB

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In a dihybrid cross, what is the expected phenotypic ratio of the offspring?

• 9:3:3:1

• 3:1

• 1:1

• 1:2:1