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First there was the RNA world, and now we have a DNA world. Why would natural selection favor the transition to a DNA-based world?
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- Is gene transfer a form of eugenics? Is it advantageous to use gene transfer to eliminate some genetic disorders? Can this and other technology be used to influence the evolution of our species? Should there be guidelines for the use of genetic technology to control its application to human evolution? Who should create and enforce these guidelines?In your group, consider the following statement: "Mutations are random, natural selection is not." What does that statement mean?Even though they have several differences, a bacterium and a human cell will both contain DNA. With respect to evolution, what does this fact suggest?
- 1. a) How does this experiment demonstrate the definition of evolution? b) Fitness of organisms is a function of the environment (that is, organisms best fit to the local environmental conditions leave more surviving offspring). How does this experiment demonstrate this fact?What is the theory of Darwinism?What did Darwin propose as the mechanism of evolution?How did Spiegelman et al.' s experiments in 1967 & 1970 on the origins of natural selection provide evidence for natural selection in an RNA-based world? A) The starting RNA strand was originally ~4,000 nucleotides; after several serial transfers it was reduced to ~200 nucleotides as a result of faster replication of shorter sequences being advantageous and selected for. B) The starting RNA strand was originally ~4,000; after several serial transfers and the introduction of additional RNA molecules it increased to ~20,000 nucleotides as a result of hybridization with the longer RNA molecules having outcompeted shorter RNA strands. C) The RNA remained at approximately is original sequence of ~4,000 nucleotides, demonstrating fitness in a stable environment. D) These experiments did not demonstrate natural selection.
- Is natural selection random with respect to fitness? I know that genetic drift, gene flow and mutations are random with respect to fitness, but I wasn’t sure about natural selection. Thanks for your help.What conditions are necessary for evolution by natural selection?How do mutations work with natural selection in the theory of evolution?