Dihybrid Punnett Squares

How many traits does a dihybrid look at?

• 1

• 2

In a dihybrid cross, what is the genotype for a plant that is heterozygous for height (T) and homozygous recessive for color (P)

• Ttpp

• TTPP

• TtPp

• TtPP

Based on this Punnett Square, which answer correctly describes the offspring?

• 3/4 are tall and purple

• All are tall and purple

• 3/4 are short and white

• All are short and white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the difference between a monohybrid and a dihybrid cross?

• A monohybrid cross produces a single offspring, whereas a dihybrid cross produces two offspring

• A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents

• A monohybrid cross involves only one heterozygous parent whereas a dihybrid cross involves both heterozygous and homozygous parents

• A monohybrid cross predits the outcome of one trait whereas a dihybrid cross predicts the outcome of two traits

Some traits are determined by more than two alleles. What are the possible gametes produced by an individual that is AaBb?

• AB, Ab, aB, ab

• BAa, Bb, AB, ab

• AB, ab

• AA, aa, BB, bb

Tags

NGSS.HS-LS3-2

What are punnett squares used for?

• Predicting the possible offspring of two parents

• Determining the alleles of a specific gene

• Identifying dominant and recessive traits

• Determining an individuals genotype

 In cacti, long arms (A) are dominant to short arms (a).  Suppose 2 heterozygous cacti are crossed.  What percentage of their offspring are expected to have short arms?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In a dihybrid cross, what is the expected phenotypic ratio of the offspring?

• 9:3:3:1

• 3:1

• 1:1

• 1:2:1

Which of the following represents a dihybrid cross?

• AaBb x AaBb

• Aa x Aa

• AaBb x aabb

• AABB x aabb

What is the probability of obtaining a homozygous recessive offspring for both traits in a dihybrid cross?

• 1/16

• 1/4

• 1/2

• 3/4

Tags

NGSS.HS-LS3-3