Lab: Natural Selection-Standard Bio 4.2

Question 1

For Hardy-Weinberg equilibrium to occur (that is, for evolution not to occur), several conditions that would cause evolution must be absent. Which of the following conditions are required for Hardy-Weinberg equilibrium? Check all that apply.

Revolt · Accepted Answer

mating is random; the population is large; there is no migration into or out of the population

Question 2

A laboratory population of beetles is kept under conditions ideally suited for that species. All the beetles’ needs are met. The space is very large, but contained.

Revolt · Accepted Answer

No

Question 3

A large natural population of sea stars have lived near shore and relatively unchanged for many generations. A hurricane causes waves that sweep large numbers of sea star larvae into the area.

Revolt · Accepted Answer

Yes

Question 4

If a population has a frequency of q = 0.25, what is the frequency of p?

Revolt · Accepted Answer

0.75

Question 5

The frequency of q in a population is 0.05. What is value of 2pq in the equation (the frequency of the heterozygous genotype)?

Revolt · Accepted Answer

0.095

Question 6

Which statement best describes the relationship between an allele’s frequency and its dominance?

Revolt · Accepted Answer

Frequency results from environmental stresses, not dominance.

Question 7

Which of the following explains why the allele for sickle-cell disease remains at a relatively high level in the population?

Revolt · Accepted Answer

It confers protection from malaria to carriers.

Question 8

Use the data in the table at right to answer the following questions.What is the total number of B alleles in the population?

Revolt · Accepted Answer

120

Question 9

What is the total number of b alleles in the population?

Revolt · Accepted Answer

80

Question 10

Calculate the frequencies for the two alleles, B and b.f(B) =

Revolt · Accepted Answer

0.6

Lab: Natural Selection-Standard Bio 4.2 Answers

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