Galapagos Finches

Question 1

Selection pressure?

Answer 1

Type of food

Question 2

Affected by?

Answer 2

Rainfall

Question 3

Explain what happen during dry year

Answer 3

Dry yr:

• small seeds less plentiful;
• larger seeds harder to crush;
• finches with larger beaks at selective adv;

Question 4

Explain what happen during wet year

Answer 4

Wet yr:

• small seeds which are abundant;
• finches with smaller beaks at selective adv;
• average beak depth decreases;