Unit 4: Mechanisms of Evolution Extras  Study Guide

Chapter 23 The Evolution of Populations Review
  1. A is a localized group of individuals of a species.
  2. Natural selection acts on individuals, but evolve, based on variations that are inherited over generations.
  3. As a population evolves, its heritable variation is reflected in change of and frequencies.
  4. A non-evolving population reaches the equilibrium due to Mendelian of alleles.
  5. At Hardy-Weinberg equilibrium, the distribution of 2 p and q in a population can be modeled by two equations.
  6. Natural populations may if conditions deviate from the Hardy-Weinberg model.
    • Genetic in small populations tends to genetic variation. In very small populations the effect can contribute to severe loss of genetic diversity.
    • Gene from the movement of individuals or gametes between populations can affect allele frequencies and tends to genetic differences between populations.
    • is the basis for natural selection, and results in unequal reproduction of alleles.
    • Sexually reproductive organisms often exhibit mating behaviors such as selection and selection.
    • Natural selection is the major mechanism that drives adaptive .
      Causes of Evolutionary Change:
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