Lesson 32: Dihybrid Punnett Squares

Which of he following generations is produced by the cross of the F1 generation with itself?

• F1 generation

• F2 generation

• P generation

• X generation

In a dihybrid cross, the two sets of (a)   being studied are located on separate chromosomes, so the traits themselves are unrelated.

If someone were to perform a trihybrid cross, or a cross where three genes re studied at the sane time, how many cells would be needed in the Punnett square?

• 64

• 32

• 16

• 128

A (a)   trait is expressed even if the individual has only one copy of the allele.

How many different phenotypes are possible for a dihybrid cross between two pea plants that are both homozygous recessive for pea shape and heterozygous for color?

• 4

• 2

• 1

• 3

For many years, Gregor Mendel studied how characteristics are transmitted from parents to offspring, which is the study of genetic ________________.

• experience

• independence

• competence

• inheritance

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

When is a recessive gene expressed in the phenotype?

• when there are two different alleles of a gene

• when there are two identical alleles of a gene

• only in the absence of a dominant allele

• only in the absence of a recessive allele

What is the expected typical ratio for a dihybrid cross involving parents heterozygous for both traits?

• 6:2:2:6

• 0:8:8:0

• 9:3:3:1

• 4:4:4:4

How many different genotypes are possible for a dihybrid cross between a parent that is homozygous dominant for both traits and a parent that is heterozygous for both traits?

• 8

• 2

• 4

• 6

A tomato plant has a genotype Wwgg. Select all possible genetic combinations that could be present in a single grain of pollen from this plant.

• wg

• WwGg

• Wg

• WG

• wwgg

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2