Dihybrid Cross

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%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

The genetic make up of this flower is ________.

• homozygous recessive

• heterozygous

• homozygous dominant

• white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Long tongues (T) are dominant to short tongues in green tree frogs.  What is the probability that two frogs that are heterozygous for long tongues could produce offspring with short tongues?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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

• 4

• 8

• 16

• 5

In tomato plants, tall vines (T) are dominant to dwarf vines (t), and red fruit (R) is dominant to yellow fruit (r). A farmer mates a homozygous tall, red tomato plant (TTRR) with a heterozygous tall, red tomato plant (TtRr). What is the percent chance that the offspring will be dwarf plants with yellow fruit?

• 0%

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

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-LS3-2

NGSS.HS-LS3-3

A way to predict genetic probability using two different

sets of alleles on two different chromosomes.

• Co-Dominance

• Incomplete Dominance

• Monohybrid Cross

• Dihybrid Cross

Tags

NGSS.HS-LS3-3

In a dihybrid cross, what is the expected phenotypic ratio of the offspring when both parents are heterozygous for two traits?

• 9:3:3:1

• 3:1

• 1:1:1:1

• 1:2:1

In pea plants, round seeds (R) are dominant to wrinkled seeds (r), and yellow seeds (Y) are dominant to green seeds (y). If a plant with genotype RrYy is crossed with a plant with genotype rryy, what is the probability of obtaining offspring with round and yellow seeds?

• 1/4

• 1/2

• 3/4

• 1/8

Tags

NGSS.HS-LS3-3

Which of the following best describes a dihybrid cross?

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

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

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

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

Tags

NGSS.HS-LS3-3