Evolution Flashcards
Mechanisms of Evolution
Mutation, Gene Flow, Genetic Drift, and Natural Selection
Mutation
A change in DNA sequence
Ex. Mongol adults ability to digest dairy
Gene Flow
Movement of genes in/out of populations
Ex. The harlequin beetle
Genetic Drift
Random changes in gene pool
Ex. The genocide of different groups
Natural Selection
Populations adapting to surroundings and passing offsprings their abilities
Ex. Africanized Honey Bees/ Giraffes
Evolutionary Sythesis
combo of genetics passed down w/concepts of evolution
Law of Independent Assortment
Alleles of diff genes are sorted into individual gametes
Law of Segregation
Two copies are segregated and distributed into gametes
Law of Codominance
Both alleles are shown in a phenotype
Patterns of Natural Selection
Directional, stabilizing, and disruptive
Directional
Favors one population more than the other –>
Stabilizing
Population stabilizes on one trait and genetic diversity decreases —^—
Distrubtive
Extreme values for a trait are favored ——^^^^
Darwin
Evolution by Natural Selection
Hutton and Lyell
Uniformitarianism: Earths crust changes by continuous and uniform processes