#1: How does the fossil record support the theory of evolution? #2: How does Lamarck's proposed method of evolution differ from Darwin's? #3: Neither Wallace nor Darwin discussed genes when describing natural selection. Why? #4: Provide three types of evidence (from different subdisciplines in biology) that scientists commonly use to provide support for the theory of evolution. #5: What biochemical clues support the idea that all living things evolved from one common ancestor? #6: A hospital uses a new cleaner to disinfect surfaces. Within a few years, many patients are developing infections from a bacterium that is resistant to the disinfectant. How does this happen? #7: population of grasshoppers in the Kansas prairie has two color types: green and brown. Typically, the prairie receives enough rainfall to maintain healthy, green grass. Assume a bird species that eats grasshoppers moves into the prairie. How will...
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Explain what it is about the fossil record that was (is) so difficult to reconcile with Darwin's theory of Evolution by Natural Selection, and offer a potential resolution of the apparent incongruity. 2. Recall the difference between "linkage" and "linkage disequilibrium". Give a hypothetical example of a scenario that you would expect to lead to the maintenance of (i.e., not transient) linkage disequilibrium at unlinked loci. 3. "Hill-Robertson Interference" (aka the H-R "effect") refers to the situation when selection at one locus "interferes" with selection at a linked locus. Give a hypothetical example of H-R interference.
Madhur L.
1. What is the role of natural selection in evolution? 2. Describe the relationship between an organism's genotype, phenotype, environment, and natural selection. 3. What five characteristics must a population have to never have a change in allele frequencies? Are all five of these possible? 4. List at least five ways that two species may be reproductively isolated from each other. 5. Would you expect members of the same family, same genus, or same species to share the most characteristics with one another? Explain. 6. Put the following in order, based on the fossil record and our understanding of evolution: birds, prokaryotes, reptiles, amphibians, fish, colonial protists, single-celled protists. 7. What were the two predictions of Darwin's theory of evolution? Has the fossil record supported those predictions? Explain your answer.
Adi S.
The geneticist James Crow wrote that successful scientific theories have the following characteristics: (1) They explain otherwise puzzling observations; (2) they provide connections between otherwise disparate observations; (3) they make predictions that can be tested; and (4) they are heuristic, meaning that they open up new avenues of theory and experimentation. Crow added two other elements of scientific theories that he considered important on a personal, emotional level: (5) They should be elegant, in the sense of being simple and powerful; and (6) they should have an element of surprise. How well does the theory of evolution by natural selection fulfill these six criteria?
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