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Look at the Punnett Square. The alleles for the parents are missing. The parents in the diagram have which of these alleles?

• DD and Dd

• Dd and dd

• Dd and Dd

• DD and dd

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Which of these choices best describes a pedigree?

• An illustration that shows the genetic diversity among different species

• A hypothesis that explains why genes are recessive or dominant

• A diagram that lists alleles of two parents and shows the possible allele combination of their offspring

• A diagram of family relationships that includes several generations

Which is true about person 3 in generation II shown in this pedigree?

• This person is an affected female

• This person is an affected male

• This person is an unaffected female

• This person is an unaffected male

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The diagram shows the results of crossing a pea plant with round seeds and a pea plant with wrinkled seeds. What can be determined from the results of the experiment?

• Smooth shape and wrinkled shape are both recessive traits.

• Smooth shape and wrinkled shape are both dominant traits.

• Smooth shape is a dominant trait, and wrinkled shape is a recessive trait.

• Smooth shape is a recessive trait, and wrinkled shape is a dominant trait

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In a species of rabbit, F is the dominant allele for brown fur, and f is the recessive allele for black fur. Two rabbits have four offspring. Three have brown fur, and one has black fur. Which of the following could describe the genotypes of the parents?

• Both parents are heterozygous, with one dominant allele and one recessive allele.
• One parent is homozygous and has brown fur, while the other is homozygous and has black fur. 
• One parent is homozygous with dominant alleles, and the other is heterozygous with two recessive alleles.
• Both parents are homozygous, and one of the parents has dominant alleles while other has recessive alleles.

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In dogs, wire hair ( A) is dominant over straight hair ( a). Two dogs having the genotype Aa produce offspring as shown in the Punnett square. What is the chance that the dogs will have a straight-haired puppy?

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-LS3-2

NGSS.HS-LS3-3

Mark and Regina are working on some genetics problems using a Punnett square to determine how the disease cystic fibrosis is inherited between generations of an affected family. Which of these choices describes the purpose of a Punnett square?

• to diagram family relationships that include several generations
• to explain why some genes are recessive and others are dominant
• o compare inherited traits to acquired traits
• to illustrate how the alleles of parents might be passed on to their offspring

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NGSS.HS-LS3-1

Florida panthers can have straight tails (S) or curly tails (s). What is the probability that two heterozygous panthers (both Ss) will have offspring with curly tails?

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-LS3-3

In a species of mammal, the gene for eye color is shown using B and b as the alleles. Brown eyes are dominant to blue eyes. Which combinations of alleles could produce brown eyes in an individual?

• BB and bb

• Bb and bb

• bb and BB

• BB and Bb

The recessive trait for male pattern baldness runs in Lebron James' family. Lebon's phenotype shows that he has the gene for baldness. His hair is slowly fading away. What combination of alleles does Lebron have for the baldness trait?

• BB only

• BB or Bb

• bb only

• Bb only

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