Dihybrid Jan 25-26

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 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

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

What genotype would go in box 3?

• AABb

• Aabb

• aabb

• AaBB

What goes in box 1

• AABb
• AABB
• aabb
• AaBb

What goes in box 3

• Aabb
• AABB
• AAbb
• aaBb

Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

• 9/16
• 3/16
• 1/16
• 16/16

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

Which trait is always expressed when present?

• recessive
• dominant
• phenotype
• allele