7 L 2 2

The Punnett square below shows the predicted genotypes of a cross between two parent organisms.

Which choice lists possible genotypes of the parents?

• Father Aa; Mother Aa

• Father AA; Mother Aa

• Father Aa: Mother aa

• Father aa: Mother AA

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The Punnett square below shows a cross between a parent that is homozygous dominant (BB) for a trait and a parent that is homozygous recessive (bb) for the same trait.

What percentage of the offspring will also be homozygous dominant for the trait?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

The diagram below shows the results of a genetic cross between two heterozygous pea plants.

If yellow is the dominant allele, what percentage of the offspring is likely to be green pea plants?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

The Punnett square below shows a cross between two individuals who are heterozygous for a trait, where the T allele is dominant over the t allele.

Which percentage of the offspring will most likely express only the recessive allele?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The Punnett square below shows phenotypes and genotypes for a cross between two parent plants.

Why will all of the F1 generation be tall?

• Both alleles for plant height are dominant.

• Both alleles for plant height are recessive.

• The allele for tall height is dominant, while the allele for short height is recessive.

• The allele for tall height is recessive, while the allele for short height is dominant.

The diagram below shows a Punnett square representing the cross between two pea plants, where yellow coloring is dominant to green coloring.

What is the probability of producing a green pea plant?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Brown fur (B) is dominant over white fur (b). The diagram below shows the crossing of two parents with brown fur.

What percentage of the offspring are likely to have white fur?

• 100%

• 75%

• 50%

• 0%

Tags

NGSS.HS-LS3-1

The diagram below shows a Punnett square for a cross between two parents with the genotypes Bb and bb.

If brown hair (B) is dominant to blond hair (b), what is the probability of these parents having a child with blonde hair?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

The diagram below shows the crossing of a tall plant and a short plant.

If tall (T) is dominant, which are the genotypes of the parent plants?

• tt and tt

• Tt and Tt

• Tt and tt

• TT and Tt

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The pedigree below shows the inheritance pattern of hitchhiker’s thumb in a multigenerational family.

How many people in this family have hitchhiker’s thumb?

• 1

• 2

• 10

• 13

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2