GMAS Practice: Punnett Squares

Achondroplasia is an inherited condition that affects the formation of bone in humans. The allele for achondroplasia (A) is dominant to the unaffected allele (a). If a person who is homozygous dominant has children with a person who is homozygous recessive, what percentage of their children will likely have achondroplasia?

Enter your answer in the box. Your answer must be a whole number.

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NGSS.HS-LS3-1

NGSS.HS-LS3-3

A model of the genetic control of coat color in rabbits is shown. Allele | Phenotype | Inheritance C | Black | Dominant to all other alleles c^ch | Chinchilla | Recessive to C; Dominant to c^h and c c^h | Himalayan | Recessive to C and c^ch; Dominant to c c | Albino | Recessive to all other alleles Which Punnett square represents a cross that would produce albino offspring?

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NGSS.HS-LS3-1

In domesticated dogs, hair type is controlled by two different alleles. The allele for wire hair is (H) and the allele for smooth hair is (h). When two heterozygous dogs are crossed, what percentage of the offspring is expected to be homozygous for smooth hair?

• 0%

• 25%

• 50%

• 75%

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NGSS.HS-LS3-1

NGSS.HS-LS3-3

A genetic cross involving two unlinked genes is represented. AaGG x aaGg. Which genotype is NOT possible in the offspring produced by the cross?

• AaGG

• Aagg

• aaGg

• aaGG

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which table shows the expected phenotypes of offspring resulting from a cross between a black angelfish and a black-lace angelfish?

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Mice have two unlinked allele pairs that affect fur color. The table shows how allele pairs affect fur color. The term "agouti" describes fur with pigmentation that changes in each hair from the shaft to the tip, giving the fur a banded appearance. Mice with the aa allele pair are albino, regardless of the second allele-pair combination. What is the probability of albinism in the offspring of a cross between two mice with AaBb alleles?

• 1/16

• 3/16

• 4/16

• 9/16

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NGSS.HS-LS3-1

NGSS.HS-LS3-3

The inheritance pattern for an autosomal dominant trait is shown in the pedigree. Based on this pedigree, what are the most likely genotypes of individuals I-1 and I-2?

• I-1: AA

• I-2: Aa

• I-2: Aa

• I-1: Aa

• I-1: aa

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NGSS.HS-LS3-1

NGSS.HS-LS3-3

In humans blood type is determined by the A, B, and O alleles. The A and B alleles are codominant to each other and dominant over the O allele. An individual with the AO genotype and an individual with the BO genotype can produce offspring with which of the following phenotypes?

• O only

• A or B only

• A, B, or O only

• A, AB, or O

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the probability of cloven hooves in the offspring of parents that are heterozygous for the trait?

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-LS3-1

NGSS.HS-LS3-3

Albinism is an autosomal recessive condition. Which circle graph shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait?

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NGSS.HS-LS3-1

NGSS.HS-LS3-3