Exam 23: Evolutionary Processes

Cystic fibrosis is a genetic disorder in homozygous recessives ff) that typically causes death in the early 30s. Over time, we would expect the f allele frequency to for this trait.

Aendtype \#individuals 50 50 400 Use the information in the table above for the next questions). -Given the information above, what is the frequency of individuals with the A₁A₁ genotype?

In 1986, a nuclear power accident in Chernobyl, USSR now the Ukraine), led to high radiation levels for miles surrounding the plant. The high levels of radiation caused elevated mutation rates in the surviving organisms, and evolutionary biologists have been studying rodent populations in the Chernobyl area ever since. Based on your understanding of evolutionary mechanisms, which of the following most likely occurred in the rodent populations following the accident?

-Which of the graphs above best represents the relationship between the intensity of directional selection and the genetic variation present within a population?

Which of the following describes what we should expect when a population is in Hardy- Weinberg genetic equilibrium?

Aendtype \#individuals 50 50 400 Use the information in the table above for the next questions). -Given the information above, what is the frequency of the A₂ allele in this population?

Which sex typically has more extreme sex- selected characteristics: males or females? Why? Give an example.

Wikelski and Romero 2003) found that large marine iguanas had higher reproductive success than smaller iguanas did. However, the large iguanas were generally in poor body condition because they could not eat enough; at higher temperatures their foraging efficiency improved, allowing them to eat more. Thus, Wikelski and Romero hypothesize that iguana size will as global warming gradually increases air and water temperatures in the Galápagos Islands.