Lecture 7

Question 1

Micro-evolution?

Answer 1

Evolution within population level. Mainly occurs through selection or drift

Question 2

Macro-evolution?

Answer 2

Evolution at or above species level. Mass extinctions and speciation.

Question 3

Biological species concept:

Answer 3

Consists of group that carries potential for interbreeding but is reproductively isolated (closed gene pool)

Question 4

Problems with biological species concept?

Answer 4

1. Only applies to sexually reproducing species
2. Suggests that two different species would never mate and produce offspring
3. Ecological species concept: Species is a set of organisms adapted to particular resource set (niche)
4. Phylogenetic species concept: evolutionary history

Question 5

Allopatric speciation?

Answer 5

When population becomes divided by geographical barrier (genetic drift and natural selection)

Question 6

Sympatric speciation?

Answer 6

Subgroups form within continuous habitat. (behavioural and temporal isolation)