Dihybrid Punnett Squares

What is the expected typical ratio for a dihybrid cross involving parents heterozygous for both traits?

• 6:2:2:6

• 0:8:8:0

• 9:3:3:1

• 4:4:4:4

How many different genotypes are possible for a dihybrid cross between a parent that is homozygous dominant for both traits and a parent that is heterozygous for both traits?

• 8

• 2

• 4

• 6

Tags

NGSS.HS-LS3-3

In a dihybrid cross, the two sets of ______________ being studied are located on separate chromosomes, so the traits themselves are unrelated.

How many different phenotypes are possible for a dihybrid cross between two pea plants that are both homozygous recessive for pea shape and heterozygous for color?

• 4

• 2

• 1

• 3

A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks? (a)  

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Select the boxes in the Punnett Square where you would find heterozygous offspring.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Georgette wants to breed her pet phoenixes, but she isn't sure if the babies will burst into blue flames or red flames. Her documents show that her female phoenix is homozygous dominant for red flames, while her male phoenix is homozygous recessive for blue flames. What color flames will the babies have?

• Red

• Blue

• Purple

• 50% Red, 50% Blue

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

According to this Punnett square​ (a)   of the offspring will be homozygous dominant, ​ (b)   Of the offspring will be heterozygous, and the remaining 25% will be homozygous ​ (c)   . As for the phenotypes, ​ (d)   of the flowers will be ​ (e)   .

• 25%

• 50%

• recessive

• 75%

• pink

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A tomato plant has a genotype Wwgg. Select all possible genetic combinations that could be present in a single grain of pollen from this plant.

• wg

• WwGg

• Wg

• WG

• wwgg

In pea plants, smooth peas (S) are dominant to wrinkled peas (s) and purple flowers (P) are dominant to white flowers (p). Two plants that are heterozygous for both traits (SsPp) are crossed. How many different genotypes will appear in the offspring?

• 2

• 4

• 6

• 9

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2