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Describe how Natural selection on single-gene traits can lead to changes in allele frequencies and thus to evolution. Natural selection for a single-gene trait can lead to changes in allele frequencies and then to evolution. For example, a mutation in one gene that determines body color in lizards can affect their lifespan.
Describe what is meant by directional selection When individuals at one end of the curve have higher fitness then individuals in the middle or at the other end.
Describe what impact stabilizing selection has on a population Stabilizing selection results in a decrease of a population 's genetic variance when natural selection favors an average phenotype and selects against extreme variations.
Describe what impact disrupting selection has on a population The disruptive selection will cause organisms with intermediate traits to reproduce less, and will allow those organisms with extreme traits to reproduce more.
Define genetic drift In small populations, individuals that carry a particular allele may leave more descendants than other individuals, just by chance.
Describe how a founder effect can happen The founder effect is a phenomena that occurs when a small group of individuals becomes isolated from a larger population.
State the Hardy-Weinberg Principle the genetic variation in a population will remain constant from one generation to the next in the absence of disturbing factors.
How do you know when a population hits genetic equilibrium 1. No mutation. No new alleles are generated by mutation, nor are genes duplicated or deleted. 2. Random mating. 3. No gene flow. 4. Very large population size. 5. No natural selection.
Created by: CaelynFoster
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