lab 2 - Darwin’s snails

Snail population headed into thicker shells

determine how populations of snails changed from before crabs were introduced and after

Differential success, variation, heritability

What is necessary for evolution to occur due to natural evolution?

Thicker/harder shells, inconspicuous colors

Determine what characteristics of the snails were important for survival

Thicker shells led to greater survival rate

How does shell thickness affect survivorship?

Passing down of a trait

What is heritability?

Cannot occur

Explain how evolution can still occur if there is no variation in a population

Changes in alleles

What are mutations?

allow for natural selection to occur through variation

What role do mutations play in the evolution of populations?