Dihybrid Gametes

Which of the following best explains what is meant by dihybrid inheritance?

• The inheritance of two different genes, located on different chromosomes, together.

• The inheritance of a single characteristic that is controlled by one gene alone.

• The possibility that three or more alleles may exist for each locus on a chromosome.

• The formation of gametes using alleles inherited from both parents.

Assume that, in guinea pigs, the allele for black fur (B) is dominant to the allele for white fur (b), and the allele for smooth fur (F) is dominant to the allele for rough fur (f). A guinea pig with genotype BbFf is crossed with a guinea pig with genotype BbFf. What is the probability (?/16) that the offspring will have black, smooth fur?

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Assume that, in plants, the allele for tall stems (D) is dominant to the allele for short stems (d), and the allele for purple flowers (P) is dominant to the allele for white flowers (p). A plant with genotype DdPp is crossed with a plant with genotype DdPp. What is the probability (?/16) that the offspring will have a tall stem and purple flowers?

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In a plant that has the genotype rrGg, what combination of alleles can be produced in the gametes?

• RG, rg

• rG, rg

• rg only

• Rg only

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What gametes are possible for an individual that is heterozygous for both traits (AaBb)?

• Aa, Bb, Cc, Dd

• AB, Ab, aB, ab

• aa, AA, bb, BB

• abba, ABBA

Tags

NGSS.HS-LS3-2

Black fur (B) is dominant to white fur (b) in Guinea Pigs. How many out of the 16 guinea pigs in the cross have black fur?

• None

• 3

• 9

• 12

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

In a dihybrid Punnett square, how many different allele combinations can result from the gametes of each parent?

• 4

• 8

• 16

• 5

In rabbits, white fur (W) is dominant to black (w), and long ears (E) are dominant to short ears (e). A breeder mates two rabbits that are heterozygous (WwEe) for both traits. What is the chance that the offspring will be black with long ears

• 1/16

• 3/16

• 4/16

• 8/16

• 9/16

Tags

NGSS.HS-LS3-3

Which of the following best describes a dihybrid cross?

• A cross between two individuals that are heterozygous for two traits.

• A cross between two individuals that are homozygous for one trait.

• A cross between two individuals that are heterozygous for one trait.

• A cross between two individuals that are homozygous for two traits.

In pea plants, the allele for yellow seeds (Y) is dominant to green seeds (y), and the allele for round seeds (R) is dominant to wrinkled seeds (r). What is the probability that offspring from a YyRr x YyRr cross will have green, wrinkled seeds?

• 1/16

• 3/16

• 9/16

• 4/16

Tags

NGSS.HS-LS3-3