Ib Exam2

In: Science

Submitted By fujiamia
Words 9821
Pages 40
1. Which of the following options factually completes the statement, "If a population is in Hardy-Weinberg equilibrium..."?

a. There can be no more than two alleles.

b. The two alleles will be present at equal frequency.

c. Allele frequencies will not change from one generation to the next.

d. The dominant allele will be more common.

|Correct Answer: |C, Allele frequencies will not change from one generation to the next. |

2. If allele frequencies do not change from one generation to the next, is the population definitely in Hardy-Weinberg equilibrium? Why or why not? No, it might not be in Hardy-Weinberg equilibrium. Any process that selectively targets heterozygotes can affect genotype frequencies without necessarily changing allele frequencies in the next generation. Examples are nonrandom mating, overdominance, and underdominance.
3. The Hardy-Weinberg equilibrium principle yields which of the following conclusions?
a. If the allele frequencies in a population are given by p and q, the genotype frequencies are given by p2, 2 pq and q2.

b. The allele frequencies in a population will not change over time.

c. If the allele frequencies in a population are given by p and q, the genotype frequencies are given by p2 and q2. d. The first and third answers are correct.

e. The first and second choices are correct.

|Correct Answer: | E, The first and third answers are correct. | |

Briefly describe all processes that can affect allele frequencies.
| |

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