GPEE: Selection and evolution Flashcards
1
Q
What is the ecosystem carrying capacity?
A
The maximum population size an ecosystem can support.
2
Q
Both _____ and _____ factors contribute to the ecosystem carrying capacity.
A
Abiotic
Biotic
3
Q
Name 4 abiotic factors:
A
- Temperature
- Light
- pH
- Water
4
Q
Name 4 biotic factors:
A
- Food
- Competition
- Predation
- Disease
5
Q
What is intraspecific competition?
A
Competition between individuals of the same species
6
Q
What is interspecific competiton?
A
Competition between individuals of different species
7
Q
Name the 3 types of natural selection:
A
- Stabilising
- Directional
- Disruptive
8
Q
What happens in stabilising selection?
A
- Favours intermediate phenotypes
- Extreme phenotypes are favoured against
- E.g. birth weight
9
Q
What happens in directional selection?
A
- Favours one extreme phenotype
- Intermediate phenotypes are favoured against
- E.g. antibiotic resistance
10
Q
What happens in disruptive selection?
A
- Favours both extremes of phenotypes
- Intermediate phenotypes are favoured against
- E.g. beak size
