B2.8 Specification

Question 1

What’s a species?

Answer 1

A specific type of animal that reproduce to have fertile offspring

Question 2

How is a species made?

Answer 2

Gene flow is isolated
Genetic differences start
Divergence

Question 3

What’s evolution?

Answer 3

Slow change in living organisms along time

Natural selection

Question 4

Evidence for evolution?

Answer 4

Fossils
DNA
Study amino sequences
Living organisms and relationships

Question 5

How do you get fossils?

Answer 5

Die, hard parts don’t decay, sediment, rises years later

If one or more of the conditions needed for decay are absent then soft parts may be preserved

Traces of organisms can be preserved

Question 6

Uses of fossils?

Answer 6

Change through time
Can try to date it to see which were around in a particular era
The position of a fossil in a rock layer give an indication about the age, oldest at the bottom

Question 7

What’s speciation?

Answer 7

Forming of new species