Bio 3.2.2 Review

a student is predicting whether the seeds of pea plants produced by the cross shown will be wrinkled (r) or round (R). This cross will produce what percentage of offspring?

• 100% round, 0% wrinkled

• 75% round, 25% wrinkled

• 50% round, 50% wrinkled

• 25% round, 75% wrinkled

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What biological concept was Mendel studying when he crossed pea plants many times over many generations?

• imbalance in ecosystems

• predator-prey relationships

• dominant and recessive traits

• male and female genetic differences

The short leg trait of the Munchkin cat would be transmitted to the next generation of cats through

• fats

• nutrients

• genes

• mutations

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A man has a recessive condition that neither of his parents expressed. His wife does not have this condition. However, she is a carrier. Based on this information, which Punnett square correctly predicts the probability that their children will have this genetic condition?

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Sickle cell anemia is a condition that affects the shape of a red blood cell.  An unaffected individual  with the genotype AA.  An affected individual can be represented with the genotype SS.  Individuals that are carriers have the genotype AS.

Sickle cell anemia is best described by the term

• incomplete dominance

• multiple alleles

• homozygous recessive

• heterozygous dominant

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Cystic fibrosis is a lethal, autosomal recessive genetic disorder.  Which statement best explains how cystic fibrosis is maintained in the gene pool?

• Organisms that are heterozygous can pass on only the dominant allele.

• Organisms that are homozygous-dominant pass on either dominant or recessive alleles.

• Organisms that are heterozygous can pass on either dominant or recessive alleles.

• Organisms that are homozygous-recessive pass on only the dominant allele.

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In fruit flies, red eyes are dominant over sepia eyes.  A male with red eyes is crossed with a female with sepia eyes.  Half of their offspring have sepia eyes and half have red eyes.  What does this indicate about the flies that were crossed?

• Both parents are homozygous for the trait.

• Both parents are heterozygous for the trait.

• The male is heterozygous and the female is homozygous recessive for the trait.

• The male is homozygous dominant and the female is heterozygous for the trait.

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What type of inheritance controls blood types in humans?

• incomplete dominance

• polygenic inheritance

• multiple alleles

• recessive genes

Vanessa crosses a white-flowered pea plant with pollen from a a purple-flowered pea plant.  When the first generation of pea plants flowers, she records the number of offspring produced with each flower color.  Vanessa's investigation is best designed to test which hypothesis?

• Purple flowers survive longer than white flowers.

• Purple flower color is a dominant trait in pea plants.

• The number of offspring produced increases with each cross.

• Flower color is determined by the number of offspring produced.

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Which of the following is influenced by both genetics and behavior?

• eye color

• hair texture

• blood type

• body weight

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