Where did Mrs. Barker come from?
*EVOLUTION: The process of change over time*
*Species: a group of organisms that share similar characteristics and can reproduce among themselves to produce fertile offspring.*
Ship similar to the HMS Beagle
***Write down the 4 conclusions Darwin Came to***
**Adaptation: A trait that helps an organism survie and reproduce**
**Natural Selection: Process by which individuals that are better adapted to their environment are more likely to survive & reproduce than other members of the same species.**
**Variation: Inherited traits that make an individual different from other members of its species.**
evolution of populations
**3 sources of genetic variations:
1. Mutations: Change in the genetic material of a cell
2. Genetic Recombination - during sexual reproduction each chromosome in a pair moves independently during meiosis. In humans, this can produce over 8,000,000,000 gene combinations.
3. Lateral gene transfer - passing of genes from one organism to another (not including offspring)
**Gene Pool: consists of all genes, including all the different alleles, that are present in a population.**
**GENETIC DRIFT: VARIATION IN THE RELATIVE FREQUENCY OF DIFFERENT GENOTYPES IN A SMALL POPULATION, OWING TO THE CHANCE DISAPPEARANCE OF PARTICULAR GENES AS INDIVIDUALS DIE OR DO NOT REPRODUCE.**
**Hardy-Weinberg Principle - states that allele Frequencies will remain constant of have genetic equilibrium, unless actos cause those frequencies to change.**
**5 conditions of the Hardy-Weinberg principle**
1. Random Mating
2. Very large population
3. No movement in or out of population
4. No mutations
5. No natural selection
*Reproductive isolation - when 2 populations no longer interbreed. Can result in the evolution of 2 separate species. Can be behavioral, geographic or temporal.