Drift and species formation

Question 1

What are the 5 agents of evolution?

Answer 1

Mutation, gene flow, non-random mating, genetic drift and selection.

Question 2

How does migration affect strong genetic drift?

Answer 2

It will reduce variation within between populations and increase variation within populations.

Question 3

What are the three pre-zygotic isolating mechanisms?

Answer 3

Habitat isolation, temporal isolation (species breed at different times) and behavioural isolation.

Question 4

Can divergence occur in populations without mutation?

Answer 4

No

Question 5

What is peripatric speciation?

Answer 5

A special version of the allopatric speciation that happens when one of the isolated populations has very few individuals. Genetic drift plays a major role in this.

Question 6

Out of the 5 agents of evolution, which ones do you need for speciation?

Answer 6

All of them apart from migration.

Question 7

What are the post-zygotic barriers to reproduction?

Answer 7

Hybrid inviability, hybrid maladaptation and hybrid sterility.

Question 8

What accelerates speciation?

Answer 8

Strong divergent sexual selection - failure to recognise potential mates.

Question 9

What it parapatric speciation?

Answer 9

When populations are separated by an extreme change in habitat.