Dihybrid Genetics

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.

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds (Y)?

• RrYy

• RRyy

• RRYy

• rryy

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

If you cross two homozygous plants (RRYY x rryy)

R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds

What percent will have round and yellow seeds?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

• BBEE x bbee

• BBEe x BbEe

• BbEE x BbEe

• BBee x BBEE

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

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