Genetics Quiz 3

The diagram shows the X chromosomes in a female fruit fly and the X and Y chromosomes in a male fruit fly. 

The two fruit flies are crossed with each other. The female offspring of the fruit flies will receive which pair of chromosomes?

• A

• B

• C

• D

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A pea plant with homozygous genes for round seeds is crossed with a pea plant that is homozygous for wrinkled seeds.

Which statement correctly predicts the results of the genetic cross?

• All the offspring will have the genotype RR.

• All the offspring will have the genotype Rr.

• Half the offspring will have the genotype RR and half will have rr.

• All the offspring will have the genotype rr.

• Half the offspring will have the genotype Rr, one quarter will be RR and one quarter will be rr.

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If Jessica has blue eyes (bb) and both of her parents have brown eyes (Bb), which of the following statements is true?

• Jessica inherited one recessive form of the gene from each parent.

• Jessica inherited both genes from her mother.

• Jessica inherited one dominant form of the gene from each parent.

• Jessica inherited both genes from her father.

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Which statement best describes the pattern of inheritance that produces 100% red-flowered offspring when a red flower is crossed with a white flower?

• Both red flowers and white flowers are dominant.

• Both red flowers and white flowers are recessive.

• Red flowers are dominant and white flowers are recessive.

• Red flowers are recessive and white flowers are dominant.

In guinea pigs, being hairless is a recessive trait. If two heterozygous hairy guinea pigs reproduce, what are the chances that they will have a hairless offspring?

• 0%

• 25%

• 50%

• 75%

• 100%

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Hawaiian happy face spiders from the island of Maui can have different markings, as shown below. A single gene determines the marking on the spiders. A plain spider is crossed with a patterned spider. The patterned spider is homozygous. The pattern allele is dominant.

What percentage of the offspring from this cross are expected to be patterned instead of plain?

• 0%

• 25%

• 50%

• 75%

• 100%

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A partial Punnett square is shown. Which of the following statements describes the parental genotypes that would result in this Punnett square?

• Both parents are heterozygous.

• Both parents are homozygous dominant.

• Both parents are homozygous recessive.

• One parent is homozygous dominant and the other parent is heterozygous.

• One parent is homozygous recessive and the other parent is heterozygous.

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Height is a polygenic trait in humans. Which of the following statements best explains the genetics of this trait?

• The gene for height is located on the Y chromosome.

• The gene for height is located on the X chromosome.

• Height is controlled by a single dominant gene.

• Height is controlled by more than one gene.

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Humans may have type O, A, B, or AB blood. This blood trait is determined by: 

• genes on X chromosomes only.

• a double crossover on the X chromosome.

• multiple alleles.

• three homologous chromosomes.

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In the winter, the fur of the arctic fox is white. In the summer, the fur darkens to a reddish brown. What most likely causes the fur of the fox to change color?

• the fox's age

• amount of sunlight present

• the fox's habitat

• the fox's genes

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