Dihybrid Crosses and Pedigrees

What is the expected phenotypic ratio in the offspring of a dihybrid cross between two heterozygous parents (AaBb x AaBb)?

• 9:3:3:1

• 3:1

• 1:1:1:1

• 1:2:1

In a pedigree chart, what does a filled square typically represent?

• A female with the trait

• A male with the trait

• A female without the trait

• A male without the trait

Calculate the probability of obtaining an offspring with the genotype AaBb from a dihybrid cross between AaBb and AaBb.

Tags

NGSS.HS-LS3-3

Which of the following best describes a genotype?

• The physical appearance of an organism

• The genetic makeup of an organism

• The environment's effect on an organism

• The behavior of an organism

Tags

NGSS.HS-LS3-2

In a pedigree chart, how can you determine if a trait is autosomal dominant?

• The trait skips generations

• The trait appears in every generation

• Only males are affected

• Only females are affected

How can you determine if a trait is X-linked recessive from a pedigree chart?

• The trait is more common in females

• The trait is more common in males

• The trait appears in every generation

• The trait is equally common in both sexes

In a pedigree chart, what does a half-filled circle represent?

• A carrier female

• A carrier male

• An affected female

• An affected male

Which of the following best describes a phenotype?

• The genetic makeup of an organism

• The physical appearance of an organism

• The environment's effect on an organism

• The behavior of an organism

In a pedigree chart, how can you determine if a trait is autosomal recessive?

• The trait appears in every generation

• The trait skips generations

• Only males are affected

• Only females are affected

If this pedigree shows a recessive disorder, what MUST the genotype of individual 4 be?

• HH

• Hh

• hh

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2