Dihybrids

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.

Tags

NGSS.HS-LS3-3

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-LS3-1

NGSS.HS-LS3-2

What gamete possibilities could come from this parent's genotype?

• AB, AB, aB, aB
• Ab, AB, Ab, ab
• Ab, Ab, Ab, Ab
• AB, aB, ab, aB

Tags

NGSS.HS-LS3-1

A parent with genotype YyRR could produce which gametes?

• YR, YR, yR, yR

• Yy, Rr, yy, rr

• Yr, Yr, yr, yR

• YR, YR, yr, yr

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A parent with genotype SsYy could produce what gametes?

• SY, Sy, sY, sy

• SY, SY, sy, sy

• Sy, Sy, Sy, Sy

• Sy, Sy, sY, sY

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What genotype would go in box 1?

• AABb

• AABB

• aabb

• AaBb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What genotype would go in box 3?

• AABb

• Aabb

• aabb

• AaBB

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What genotype would go in box 13?

• AaBb

• aabb

• AABB

• AAbb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In peas, round is dominant to wrinkled and yellow is dominant to green. Based on this dihybrid cross, what fraction of the offspring will have wrinkled, yellow seeds?

• 9/16

• 3/16

• 1/16

• 16/16

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2