Practice questions for Final

1. Evidence for evolution is provided by the fact that
   1. the wings of insects and the wings of birds are analogous structures
   2. fossil reptiles predate fossil fishes
   3. islands with similar environments in different parts of the world are usually populated by species that are closely related to the respective nearby mainland species
   4. all of the above
   5. none of the above

2. Natural selection acting against extreme phenotypes and favoring intermediate variants is
   1. directional selection
   2. diversifying selection
   3. stabilizing selection
   4. neutral variation
   5. genetic drift

3. The morphological species concept defines species on the basis of
   1. similarity in the nucleotide sequence of mitochondrial DNA
   2. characteristics that maximize successful mating
   3. where they live and what they do
   4. measurable physical features
   5. ability to interbreed to produce viable, fertile offspring

4. In order to sort out the relationship of very distantly related species, it is best to compare
   1. nuclear DNA sequences
   2. mitochondrial DNA sequences
   3. ribosomal RNA sequences
   4. amino acid sequences
   5. transfer RNA sequences

5. If the frequency of the sickle cell allele is 0.1 in a human population, the frequency of heterozygotes in the population will be
   1. 0.01
   2. 0.18
   3. 0.9
   4. 0.1
   5. 0.2

6. Sources of genetic variation include
   1. genetic drift
   2. sexual recombination
   3. assortative mating
   4. all of the above
   5. none of the above

Answers

1. c
2. c
3. d
4. c
5. b
6. b

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