Definitions: 1. Based on the outcome of natural selection, describe four different modes of natural selection. Provide one example for each mode. Each example must be different from the ones taught in lecture and lab ppt.

results in condensed chromatin, which makes DNA inaccessible, and results in open chromatin, which makes DNA accessible. Oxidation; Nitrification OAcetylation; methylation O Methylation; acetylation O Nitrification; oxidation

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Given the chart below, is evolution occurring on the given trait? Hint: Revisit the Hardy-Weinberg equilibrium lecture.   Group of answer choices Yes, evolution is occurring. Cannot be determined based on the given information. No, evolution is not occurring and the trait exists in a state of Hardy-Weinberg equilibrium.

You study a group of wombats for your honours thesis. You find in your very large population samples a non-synonymous mutation at intermediate frequency (p = 0.45). After years of work, you find that both alleles (the mutant and the non-mutant) are maintained in the population. Whose theory is your %3D work MOST CONSISTENT with? The Balance School of Ford and Dobzhansky Lamarck's inheritance of acquired characteristics Haldane's theory on mutation-selection balance Kimura's Neutral Theory

Fitness is most correctly,a technical term.what does it mean ?what two things do you suppose govern the rate of evolution by natural selection? explain how darwinian evolution can decrease and increase of an allele (or a more heritable traits,for that matter )

A. What does it mean if an allele is “fixed”?  B. Explain one reason why EVEN if an allele is undergoing strong positive selection it may not become fixed in the population.

Describe the similarities and differences between the stabilizing, directional, and disruptive selection models.

Under which of the following scenarios would variation be maintained? Selection acting on a dominant high fitness allele Selection acting on a recessive high fitness allele Selection favoring heterozygotes Selection acting against heterozygotes None of the above

Becca loves German Shepherds and wants to have one as a pet. She locates a breeder and agrees to purchase one of the puppies. Which type of selection occurs from this type of human intervention?         directional selection         stabilizing selection         disruptive selection         artificial selection