Lecture 27 - Evolutionary Genetics Flashcards
1
Q
What is overdominance and underdominance?
L27 S6
A
Overdominance:
- heterozygote is selected for and has an advantage
- e.g. sickle cell heterozygosity due to lowered malaria susceptibility
Underdominance:
-heterozygote is selected against and has a disadvantage
2
Q
What is a special characteristic about the Mennonite community that makes it ideal for genetics research?
L27 S13
A
They have a rather closed off population
3
Q
What is evolution?
L27 S20
A
Change in gene frequency in a group over time
4
Q
What is anagenesis and cladogenesis?
L27 S20
A
Anagenesis:
-evolution within a single group over time
Cladogenesis:
-evolution resulting in the splitting of one lineage into two separate species
5
Q
What are the different mechanisms of reproductive isolation?
L27 S29
A
Prezygotic:
- ecological
- behavioral
- temporal
- mechanical
- gametic
Postzygotic:
- hybrid inviability
- hybrid sterility
- hybrid breakdown
