BIOL Flashcards
(8 cards)
Define evolution
Evolution is a change in gene frequencies in a population over the generations
What is natural selection?
non-random reproductive success
What is genetic drift?
Genetic drift is random change in gene frequencies in a population due to small population size.
1 for Charles Darwin Outline
All organisms have tremendous capacity for reproduction
BUT
Resources are limited
SO
There will be a struggle for existence (not all who are born will be able to survive and reproduce)
2 for Charles Darwin Outline
WE ALSO KNOW THAT
Individuals within populations are variable, and some of that variability is heritable
3 for Charles Darwin Outline
Some individuals are better suited to current environmental conditions than others , so individuals with some characteristics will survive and reproduce better than others.
4 for Charles Darwin Outline
The genetic makeup of populations will change over the generations and so average phenotypes of the organisms will change
5 for Charles Darwin Outline