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BIOL1022 CH21

TermDefinition
3 Conditions for Evolution by Natural Selection Phenotypic variation must exist within the population, the variation must lead to differences among individuals, and the differences must be hereditary.
Artificial Selection Genetic change initiated by humans for favorable traits
Rock Fossil Causation 1. Organism buried in sediment 2. Calcium/Other hard tissue mineralizes 3. Surrounding sediment hardens into rock
Isotope Dating Uses either Potassium-40 or Carbon-14, uses the half life of these samples to determine the age of rock
Evolutionary Transitions Somewhat clear instances of a middle ground between one species and another
Anatomical Similarities Animals sharing a common structure but utilizing them in vastly different manners
Anatomical Imperfections Faulty traits inherited from a common ancestor that never had the capacity to change (ex: giraffes with only 7 neck vertebrae)
Vestigial Structures Structures left over on an organism that have lost function and serve little to no purpose
Psuedogenes Leftover genes that have become deactivated, points to an ancestor that once had said traits
Biogeography Study of geographic distribution of species
Convergent Evolution Similar traits arising in mostly unrelated organisms independently
Created by: beaniao
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