Evolution: Questions

Topics: Evolution, Allele, Population genetics Pages: 5 (902 words) Published: April 3, 2014
AP Biology Name:__________________________

Evolution Free Response Questions

Answer the following questions in essay form. Outline form is not acceptable. Labeled diagrams may be used to supplement discussion, but in no case will a diagram alone suffice. It is important that you read each question completely before you begin to write. Your answers may be hand written or typed. You may use your notes and textbook to answer the question, but you may not discuss or write the question with anyone else. You will receive a zero for the assignment if there is any evidence that this is not your own work.

1. Charles Darwin proposed that evolution by natural selection was the basis for the differences he saw in similar organisms as he traveled and collected specimens in South America and on the Galapagos Islands.

A. Explain the theory of evolution by natural selection as presented by Darwin.

B. Each of the following related to an aspect of evolution by natural selection. Explain three of the following. Convergent evolution and similarities among species (ecological equivalents) in a particular biome (e.g. tundra, taiga, etc). Natural selection and the formation of insecticide-resistant insects or antibiotic resistant bacteria Speciation and isolation

Natural selection and behavior such as kinesis, fixed action pattern, dominance hierarchy, etc. Natural selection and heterozygote advantage

2. Do the following with reference to the Hardy-Weinberg model. A. Indicate the conditions under which allele frequencies (p and q) remain constant from one generation to the next.

B. Calculate, showing all work, the frequencies of the alleles and frequencies of the genotypes in a population of 100,000 rabbits of which 25,000 are white and 75,000 are agouti. (In rabbits the white color is due to a recessive allele, w, and agouti is due to a dominant allele, W.)

C. If the homozygous dominant condition were to become lethal, what would happen to the allelic and genotypic frequencies in the rabbit population after two generations?

3. Define, discuss, and give an example of how each of the following isolating mechanisms contributes to speciation in organisms. a. Geographical barriers
b. Ecological (including seasonal) isolation
c. Behavioral isolation
d. Polyploidy

2. EVOLUTION QUESTION - 1989L. PETERSON/AP BIOLOGY

Do the following with reference to the Hardy-Weinberg model. A. Indicate the conditions under which allelic frequencies (p and q) remain constant from one generation to the next. B. Calculate, showing all work, the frequencies of the alleles and the frequencies of the genotypes in a population of 100,000 rabbits, of which 25,000 are white and 75,000 are agouti. (In rabbits the white color is due to a recessive allele, w, and agouti is due to a dominant allele, W.) C. If the homozygous dominant condition were to become lethal, what would happen to the allelic and genotypic frequencies in the rabbit population after two generations?

STANDARDS:

A. CONDITIONS FOR HARDY-WEINBERG: 5 pts Max 3

H-W applies if:

large population size (1 pt) no genetic drift or founder effect
random mating (1 pt) no mating preference or inbreeding
no mutation (1 pt)

no selection (1 pt) all genotypes have equal chance to reproduce
no migration (1 pt) no differential migration; no gene flow among populations;

B. PROBLEM Max 6
formula (1 pt) p2 + 2pq + q 2 = 1

relationship to genotypes WW Ww ww or W = p (1 pt) w = q definition of all terms of equation
calculation to frequency 25,000/100,000 = frequency ww = q2 (1 pt) = 0.25 or 1/4 or 25%
allele frequencies (2 pts) q = .25 = .5 = frequency of w (1...
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