Inheritance and Genetics Practice Test

Red flower color is dominant to white flower color in rose plants. What is the expected results of a cross between two heterozygous rose plants?

• 100% red

• 75% red, 25% white

• 50% red, 50% white

• 25% red, 75% white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

One parent is heterozygous for a certain trait (Dd). The other parent is homozygous dominant (DD) for that trait. What is the percent chance that an offspring from this cross will be heterozygous

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS4-3

A geneticist studying fruit flies hypothesizes that short wings are a recessive trait coded for by a single gene. Which observation is most likely to have led her to form this hypothesis?

• flies have wing lengths ranging from very long to very short

• flies with long wings are less likely to survive

• flies with long wings can produce offspring with short wings

• flies with short wings prefer to mate with flies with long wings

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?

• 0 in 4

• 1 in 4

• 2 in 4

• 4 in 4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In a plant that has red flowers, red flower color, R, is completely dominant to white flower color, r. If the plant is heterozygous for flower color, which alleles will be carried by the gametes it produces?

• R and r

• R only

• r only

• Rr only

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Timothy has attached earlobes like his maternal grandfather. His mother and father have free earlobes, which are dominant. Which statement best explains how Timothy inherited attached earlobes.

• He received a recessive allele from each parent

• He received a dominant allele from each parent

• He received a recessive allele from his mother and a dominant allele from his father

• He received a dominant allele from his mother and a recessive allele from his father

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Two plants are crossed, and the traits of height and color are assessed in the offspring. The following cross was conducted: TTPP x ttpp

T = dominant allele for height, tall plant

t = recessive allele for height, short plant

P = dominant allele for color, purple

p = recessive allele for color, white

Which of the following choices correctly describes the offspring?

• Three quarters of the plants are tall and purple

• Three quarters of the plants are short and white

• All are short and white

• All are tall and purple

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In squash plants, yellow fruit (Y) is dominant to white fruit (y). If two plants heterozygous for yellow fruit are crossed, what are the possible genotypes of the offspring?

• Yy only

• YY, yy only

• Yy, yy only

• YY, Yy, yy only

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Albino individuals lack all pigmentation so that their hair and skin are white. This family tree shows that albinism -

• is carried only by females in this family

• is a recessive genetic trait

• is a sex-linked gene

• requires both parents to be albinos

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In snapdragons, the combined expression of both alleles for flower color produces a new phenotype that is pink. This illustrates incomplete dominance. The Punnett square above shows that both the white and red snapdragons are homozygous. Which of the following would be the correct product from a cross between two heterozygous pink snapdragons.

• 2 red, 1 pink, 1 white

• 1 red, 2 pink, 1 white

• 1 red, 1 pink, 2 white

• 2 red, 2 white