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Western University
Biology 1001A
Tom Haffie

Part 1 of 7 - This assessment allows 30 minutes and has 12 questions. Each question is straightforward and has only one correct answer. There are no penalties for incorrect answers on any question. Question 1 of 12 1.0 Points Which of the following processes tends to reduce levels of genetic variation within a population? A. Mutation. B. Negative frequency-dependent selection. C. Genetic drift. D. Gene flow (migration). Reset Selection Part 2 of 7 - Question 2 of 12 1.0 Points Snapdragons are plants that have flower colour controlled by the R locus. Red flowers have the genotype RR; White flowers have the genotype rr; Pink flowers have the genotype Rr. You measure lifetime offspring (seedling) production in a large population of snapdragons and observe that on average, red-flowered individuals produce 20 seedlings during their lives; and pink-flowered individuals produce 30 seedlings during their lives. Which of the following statements is correct? A. Both R and r alleles are disadvantageous; unless a new mutation occurs at the flower- colour locus, the population will probably go extinct. B. Heterozygote advantage is operating on flower colour. C. Genotype Rr has the highest absolute fitness, but all three genotypes have the same relative fitness. D. Flower colour is selectively neutral. Reset Selection Part 3 of 7 - Question 3 of 12 1.0 Points Which of the following hypothetical new mutations is MOST likely to eventually spread to fixation, that is, to reach an allele frequency of 1? A. A beneficial recessive allele. B. An allele at a locus subject to heterozygote advantage. C. An allele at a locus that is neutral with respect to fitness. D. A beneficial dominant allele. Reset Selection Part 4 of 7 - Question 4 of 12 1.0 Points Which of the following is NOT part of the theory of evolution proposed by Darwin? A. Gradualism (most evolution proceeds gradually, with changes accumulating in each generation). B. Transformation (individuals modify their phenotype in response to selection pressure imposed by the environment). C. Common ancestry (all forms of life have evolved from a common ancestor). D. Speciation (lineages have diverged to form many species). E. All of these are components of Darwinian Theory. Reset Selection Question 5 of 12 1.0 Points Before they hatch, embryos of some types of snake grow hindlimb "buds"; despite the fact that adult snakes do not have, or need, hind limbs. How does this observation support the theory of evolution? A. It demonstrates that speciation has occurred at least once in the past. B. It suggests that snakes have descended from ancestors that had hind limbs. C. It suggests that natural selection is the most important evolutionary mechanism. D. It demonstrates that individuals can change over the course of their lives. Reset Selection Question 6 of 12 1.0 Points Which of the following best describes the "cost of males"? A. In sex-role reversed species, females have to compete for access to males. B. Populations that reproduce sexually (producing daughters and sons) do not grow as quickly as populations that reproduce asexually and produce only daughters. C. Sperm are energetically expensive to produce. D. Investing in sexually selected tra
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