Lecture 11 04/01/2014
Human Evolution and Diseases
Artificial Selection: Ex: Pigeons Selection by humans for particular traits.
Mutation: type of variation. Some diseases are caused by mutations
Genetic Drift: evolutionary change as a result of random factors. Most significant in small populations.
Founder Effect: small populations budding off from a larger population.
Bottleneck effect: a restriction in genetic variability with a decrease in population size.
Gene flow: exchange of gene between populations AND HAS An EFFECT OF MAKING populations more
Sickle cell anemia: caused my mutation
Heterozygous – advantage – protection from malaria
Polymorphism: there’s multiple forms.
If you are in a area where malaria isn’t common, then sickle cell isn’t much help.
There’s a higher mutation rate with in the sickle cell especiall