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Bio 1000 Assessment 2.docx

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Biology 1001A
Beth Mac Dougall- Shackleton

Assessment 2 Table of Contents Time Remaining: 0:20:09 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. Gene flow (migration). C. Mutation. D. Genetic drift. Reset Selection Part 2 of 7 - Question 2 of 12 1.0 Points In a hypothetical population of lizards, skin colour is controlled by the G locus. Individuals with genotype GG are green; Individuals with genotype gg are black; Individuals with genotype Gg are green with black stripes. You observe 100 lizards and count 4 green, 64 black, and 32 green-and-black striped lizards. What can you reasonably conclude about selection on skin colour in this population? A. Green lizards have the highest average fitness; selection is favouring the G allele. B. Black lizards have the highest average fitness; selection is favouring the g allele. C. Striped lizards have the highest average fitness; selection will maintain both G and g alleles in the population. D. Skin colour does not appear to affect fitness in this population. 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 that is neutral with respect to fitness. C. An allele at a locus subject to heterozygote advantage. 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 natural selection is the most important evolutionary mechanism. C. It demonstrates that individuals can change over the course of their lives. 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. Sperm are energetically expensive to produce. B. In sex-role reversed species, females have to compete for access to males. C. Populations that reproduce sexually (producing
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