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Natural Selection

TermDefinition
Charles Darwin “Father” of the theory of evolution
theory based on many facts that lead to probable inference; answers HOW
law explains relationships between variables; answers WHAT
Theory of Evolution states that it is possible for change in the genetic composition of a population to occur over generations
population a group of organisms of the same species that live and reproduce with one another
genetic composition/ frequency of a population how frequent (common) an allele (gene variant) is in a population
mutation a change in genetic material
recombination process by which DNA strands are broken and repaired, producing new combinations of alleles that can lead to greater fitness for the organism
genetic drift change in gene frequency due to random chance
gene flow/migration moving of organisms with different traits into a population
natural selection a process in which organisms that are better suited/ fit for an environment tend to survive and reproduce
fitness organisms in a population is based on ability to reproduce and pass on their traits
adaptation a trait (structural, physiological, or behavioral) that improves an organism’s ability to survive in its environment
genetic variation a result of genes found in the organism
disruptive selection occurs when extreme phenotypes for a trait are adaptive
stabilizing selection occurs when extremes in phenotypes give individuals in the population a disadvantage
directional selection occurs when organisms with a particular phenotype have an advantage in their environment
Created by: NEISDSci
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