Punnett Square Quiz Review

This diagram shows the possible genotypes and phenotypes for the offspring in a simple genetic cross.
What are the genotypes of the two parents in this genetic cross?

• One parent is TT; the other parent is Tt.

• One parent is TT; the other parent is tt.

• Both parents are short.

• Both parents are tall.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

This Punnett square shows a cross between two heterozygous tall plants, where T indicates the dominant allele. Which choice describes the phenotypes of the offspring?

• They have a 25% chance of being tall.

• They have a 50% chance of being tall.

• They have a 75% chance of being tall.

• They have a 100% chance of being tall.

The allele for dimples is dominant (D) over the recessive allele (d). A woman with dimples (DD) and a man with dimples (DD) have a child. What is the probability that the child will have dimples?

• 0%

• 25%

• 50%

• 100%

In spiders, having a hairy body is dominant to a bald body. A homozygous hairy spider is crossed with a bald spider. What are the possible phenotypes of the offspring?

• 100% hairy; 0% bald

• 50% hairy; 50% bald

• 25% hairy; 75% bald

• 75% hairy; 25% bald

Which Punnett square represents the cross of two heterozygous red flowering plants?

• 
• 
• 
• 

This Punnett square shows a cross between a black cow (Bb) and a white cow (bb). What phenotypes result from this cross?

• 100% black cows

• 100% white cows

• 75% black cows; 25% white cows

• 50% black cows; 50% white cows

This Punnett square represents a cross between two organisms.

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For this trait, red (R) is dominant to white (r). Which choice represents the phenotypes of the offspring organisms?

• all red organisms

• all white organisms

• 75% red organisms and 25% white organisms

• 50% red organisms and 50% white organisms

In spiders, a hairy body (H) is dominant to a bald body (h). Two spiders that are heterozygous for body type are crossed. Which genotypes are produced in the offspring?

• HH, Hh, and hh

• HH and Hh

• Hh and hh

• Hh only

This Punnett square shows a cross between two heterozygous parent plants.
In this species of plants, petal color is a codominant trait. Red (R) petal color is dominant, white (r) petal color is recessive, and heterozygous plants (Rr) display pink petals. What is the percentage chance that offspring plants from the two parents plants shown in the Punnett square above will produce plants with pink petals?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.MS-LS4-4

Aspen trees can have round leaves (R) or oval leaves (r). What are the phenotypes of the offspring if the parents are homozygous dominant?

• 75% round, 25% oval

• 25% round, 75% oval

• 100% round

• 100% oval