1
Q
What is evolution?
A
“Evolution is the change over time in allele frequencies, the genetic makeup, in a population of organisms and is the foundation of modern biology, genetics, and ecology”
2
Q
What must there be in a population for selection to occur?
A
- Variation within populations
- Heritability of at least some of this variation
- Excess offspring per generation
- Non-random survival and reproduction
3
Q
Is selection more efficient in larger or smaller populations?
A
Larger
4
Q
What are the three ways that natural selection acts on phenotypes?
A
- Directional selection (Most efficient for changing allelic frequency)
- Disruptive selection (Intermediate phenotype is a disadvantage)
- Stabilizing selection (Intermediate phenotype is an advantage)
5
Q
Which evolutionary forces affect the distribution of sickle cell anemia in populations?
A
In a population where malaria is present natural selection is the most prominent followed by gene flow.
