B2.12: Surviving In A Changing Environment

Question 1

What is evolution?

Answer 1

Gradual change in an organism over time.

Question 2

What is natural selection?

Answer 2

Mechanism by which species evolve. The best adapted individuals are more likely to survive and reproduce, and so pass on their genes.

1. Large populations
2. Survival
3. The fittest
4. Passing on the advantage

Question 3

How are new species formed?

Answer 3

1. Populations become seperated by some barrier (geogrqphic/ behavioural)
2. Over time, each group evolves differently in diff conditons. Longer they are seperated, more diff they become
3. Two sub-populations have changes so much that they can no longer interbreed. They formed seperate but closely related species.