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Summarize Darwin's observations that drive change in species over time.
- 1. Variations in traits exist.
- 2. These variations (traits) are heritable.
- 3. Species overproduce.
- 4. There is a competition for resources; not all offspring survive.
What are the four evidences of evolution?
- 1. Natural selection
- 2. Homology
- 3. Fossil Record
- 4. Biogeography
What are the five conditions for Hardy-Weinberg Equilibrium?
- 1. No mutations.
- 2. Random mating
- 3. No natural selection.
- 4. Extremely large population size.
- 5. No gene flow.
What three major factors alter allelic frequency and bring about evolutinoary change?
- 1. Natural selection
- 2. Genetic drift
- 3. Gene flow
Type of selection that removes extreme variants from the population and preserves intermediate types.
Type of selection that shifts the overall makeup of the population by favoring variants that are at one extreme of the distribution.
Type of selection that favors variants at both ends of the distribution.
Type of isolation where two species that occupy different habitats within the same area may encounter each other rarely, if at all, even though not isolated.
Type of prezygotic reproductive barrier where species that breed during different times of the day, different seasons, or different years cannot mix their gametes.
Type of prezygotic reproductive barrier where behaviors unique to a species are effective reproductive barriers. Such behavioral rituals enable mate recognition as to identify potential mates of the same species.
Type of prezygotic reproductive barrier where mating is attempted, but morphological differences prevent its successful completion.
Type of prezygotic reproductive barrier where sper of one species may not be able to fertilize the eggs of another species.
Type of postzygotic reproductive barrier where the genes of different parent species may interact in ways that impair the hybrid's development or survival in its environment.
Reduced hybrid viability
Type of postzygotic reproductive barrier where when chromosomes of the two parent species differ in number or structure, meiosis in the hybrids may fail to produce normal gametes.
Reduced hybrid fertility
Type of postzygotic reproductive barrier where first generation hybirds are viable and fertile, but when they mate with one another or with either parent species, offspring of the next generation are feeble or sterile.