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- 1. Multiple ChoiceThe effects of natural selection may be countered bygene flowgenetic driftmutationinbreeding
- 2. Multiple ChoiceIn relation to natural selection, evolution is theprocessoutcomemechanismpurpose
- 3. Multiple ChoiceScientists generally agree that heterozygous advantage israrefrequentpervasivenone of the above
- 4. Multiple ChoiceEven though sickle-cell anemia is usually fatal to homozygous individuals, the disease persists because:gene therapy has alleviated the conditionthe disease is carried on a dominant alleleindividuals with one allele for sickle-cell anemia are resistant to malaria
- 5. Multiple ChoiceMating with relatives is calledinbreedingoutcrossingrandom matingpolymorphic
- 6. Multiple ChoiceThe random loss of alleles in a population is calledmutationselectiongenetic driftgene flow
- 7. Multiple ChoiceSickle cell anemia is caused by a change in the amino acid sequence of the two beta chains in the hemoglobin molecule. How many amino acids have been changed in each beta chain, compared to normal hemoglobin1510100
- 8. Multiple ChoiceA person with sickle cell trait, having one S allele and one normal, will be resistant to malaria and eventually develop sickle cell anemia.truefalse
- 9. Multiple ChoiceSickle-cell trait in humans is a classic example of ____________________.how mutations can lead only to tragic outcomeswhy outbreeding is importantthe superior fitness seen in heterozygotes
- 10. Multiple ChoiceA scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference is 2 cm. What would you expect the most common circumference(s) to be after 10 generations of stabilizing selection?2cm4cm5cm12cm
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