Topic 5 Flashcards
1
Q
Ecosystem
A
All biotic and abiotic features in an area
2
Q
Define habitat
A
Place where organisms lives
3
Q
Population
A
All organisms of one species in a habitat
4
Q
Population size
A
Abundance of one species in area
5
Q
Community
A
All organisms of different species that live and interact in same habitat
6
Q
Abiotic features
A
Non living features: temp, water availability, soil pH
7
Q
What causes speciation to happen
A
- Reproductively isolated
- This rescues gene flow between populations
- Natural selection acts on each population separately
- Allopatric and synpatric isolation
8
Q
Describe allopatric isolation
A
- Different conditions
- Different selection pressure
- Different advantageous alleles increase in frequency
- Now two genetically distinct populations
9
Q
What are the 3 ways reproductive isolation occurs
A
- Seasonal changes
- Mechanical changes
- Behavioural changes
