Causes Of Evolution Flashcards
What 2 requirements are needed for evolution?
1) Genetic variation
2) Environmental pressure
Random mutation is defined as
A sudden change in DNA causing variation from original population
Most mutations come with a price of what?
Death to the organism
A variation favored by natural selection is..?
Adaptation
Anything that increases survival and reproduction will add to..?
Evolutionary Fitness
Evolutionary fitness depends on what?
Environment
Male peacock feathers is an example of what?
Sexual selection
Sexual selection means?
When a Female chooses a male NOT for his fitness BUT his APPEARANCE!
Defined as a random event that causes a shift in allele frequencies and phenotypes expressed
Genetic drift
This affects small population the most.
Genetic Drift
2 Examples of genetic drift are?
Bottleneck and Founder affect
Bottleneck means
A disaster that causes few of OG pop to survive so there are less phenotypes shown from OG pop.
Ex of bottleneck
Squirrels and burnt forest
Founded affect means?
When small portion of small pop find new island and take over and only express small percent of OG pop.
Ex of Founder affect?
Birds in a new island
When an organism from Pop B joins Pop A and causes shift in allele frequency
Gene flow
Why are small population eats prey for Gene flow?
Because there already is a small amount so a new allele introduced will affect it more.
Think: “Butterfly dark with butterfly light. And making more whites.”
