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370 review answers - 1 Darwins theory did not account for...

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1. Darwin’s theory did not account for how traits were inherited. He did not have an understanding of genes. 2. Convergence is when organisms form similar structures as solutions to similar problems and natural selection favors similar structures. Convergence provides support for evolution because the trait is heritable, it increases fitness, and it occurs in a population. 3. One could observe strong natural selection but no evolution if natural selection is acting on variation that is not heritable. Then by definition there cannot be evolution. 4. Evolution is by definition seen over a population. Evolution takes in account the change in allele frequencies over time and in order to view this it must be looked at in individuals in a population over time. 5. Directional selection occurs when a one trait survives over another that is selected for such as with the moths. The white moths are selected for and the dark moths have an increase of mean fitness. Stabilizing selection occurs when the extreme traits are selected for as we saw when light moths and dark moths were selected for and the moths in between had an increase in mean fitness. 6. In order for us to see a viable mutation it must increase a population’s fitness. On the other hand most mutations are deleterious. Selection acts to remove them from populations. Mutations occur at random with respect to the environment. A mutation is an error in replication of nucleotide sequence or any other alteration of the genome that is not due to recombination. Most errors that cause a mutation
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