12.1

Question 1

What is variation and why is it important?

Answer 1

Variation is the difference in alleles within a population, and is important because more gene variation means that populations can recover from disasters.

Question 2

How do new alleles pop up in any population?

Answer 2

Mutations during cell division

Question 3

When genes have higher fitness, they show up __ in the gene pool over time

Answer 3

more

Question 4

Does change in over time happen individually or across the whole population?

Answer 4

Across whole population

Question 5

What are selective pressures?

Answer 5

Selective pressures are factors that can be sexual, environmental, or physiological and select for certain alleles based on what has better results for life.

Question 6

How is genetic drift different from natural selection?

Answer 6

Natural selection favors desirable traits, while genetic drift is entirely chance.