Dihybrid Crosses Lesson

Heredity & Genetics: Dihybrid Crosses

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Multiple Choice

Which of the following is the genotype for a purebreed dominant alleles?

• ggYy

• GGYy

• Ggyy

• GGYY

Multiple Choice

What goes in box 3

• Aabb
• AABB
• AAbb
• aaBb

Multiple Choice

What goes in box 15

• aabb

• AABB

• aaBB

• AAbb

Multiple Choice

What genotype is missing from this Punnett Square?

• RrYy
• RRYY
• rryy
• RrYY

Multiple Choice

Assume mom's gametes are on the left, what is her genotype?

• TTZz
• TtZz
• ttZZ
• TtZZ

Multiple Choice

What genotype is missing from this Punnett Square?

• RrYy
• RRYY
• rryy
• RrYY

Multiple Choice

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%