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Assessment 2-A.docx

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Western University
Biology 1001A
Tom Haffie

Assessment 2 Table of Contents Time Remaining: 0:15:55 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. Negative frequency-dependent selection. B. Mutation. 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. Heterozygote advantage is operating on flower colour. B. Genotype Rr has the highest absolute fitness, but all three genotypes have the same relative fitness. C. Flower colour is selectively neutral. D. Both R and r alleles are disadvantageous; unless a new mutation occurs at the flower-colour locus, the population will probably go extinct. 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 dominant allele. B. A beneficial recessive allele. C. An allele at a locus that is neutral with respect to fitness. D. An allele at a locus subject to heterozygote advantage. 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 demonstrates that individuals can change over the course of their lives. C. It suggests that natural selection is the most important evolutionary mechanism. D. It suggests that snakes have descended from ancestors that had hind limbs. Reset Selection Question 6 of 12 1.0 Points Which of the following best describes the "cost of males"? A. Investing in sexually selected traits, and fighting over access to females, can reduce male survivorship. B. Sperm are energetically expensive to produce. C. Populations that reproduce sexually (producing daughters and sons) do not grow as quickly as populations that reproduce asexually and produce only daughters.
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