Evolution Flashcards
Evolution
Change in a population over time
Natural Selection
The driving force of evolution that operates on the level of an individual
Charles Darwin
Father of Evolution
Jean-Baptiste de Lamarck
Proposed that acquired traits were passed on to offspring
Paleontology
The study of fossils
Biogeography
The study of the distribution of flora and fauna in the environment
Flora
Plants
Fauna
Animals
Embryology
The study of the development of an organism
Comparative Anatomy
The study of the anatomy between various animals
Homologous Structures
Structures that look similar but have different functions
Analogous Structures
Structures that look different but have the same function
Molecular Biology
The study of life at the molecular level
Genetic Variability
The differences among each individual in a population
Random Mutation
Random changes in DNA that can be either beneficial or harmful to an organism
Directional Selection
One phenotype was favored at one of the extremes of the normal distribution of organisms
Stabilizing Selection
Means that an organisms in a population with extreme traits was eliminated
Disruptive Selection
Favors both extremes and selects against common traits
Species
Organisms are a species when they cannot reproduce and have viable offspring with another organism
Speciation
The emergence of new species
Divergent Evolution
Results in closely related species with different behaviors and traits
Convergent Evolution
Two unrelated and dissimilar species come to have similar traits
Allopatric Specitation
A population becomes separated from the species through a geographical barrier
Sympatric Speciation
New species form alongside each other
Hardy-Weinberg Law
States that even with all the shuffling of genes that occurs, the relative frequencies of genotypes in a species are still there
Hardy Weinberg Equation
p + q = 1
p^2 + 2pq + q^2 = 1
Hardy Weinberg Equilibrium Requirements
- Large Population
- No Mutations
- No Immigration/Emigration
- No Natural Selection
- Random Mating
Genetic Drift
Movement of a population from or into a gene pool