Natural Selection

Question 1

What did biologists believe in the 1930s?

Answer 1

Small new changes in genetic metrial are the fuel for natural selection

Question 2

Modern Synthesis

Answer 2

Evolution occurs in 2 stages:
1. The production and redistribution of variation
2. Natural Selection acts on this variation

Question 3

Modern Synthesis definition of Evolution

Answer 3

A change in allele frequency from one generation to the next

Question 4

Microevolution

Answer 4

Short-term evolutionary changes

Question 5

Macroevolution

Answer 5

Long-term changes throughout fossil history

Question 6

5 Causes of Allele Frequency Change

Answer 6

• Natural Selection
• Mutation
• Migration
• Genetic Drift
• Non-Random Mating

Question 7

Natural Selection

Answer 7

Individuals w/ adaptive traits are more likely to survive and pass on their alleles to the next generation

Question 8

Fitness

Answer 8

The probability of survival and reproduction of an organism

Question 9

2 Components of Fitness

Answer 9

• Differential survival or mortality
• Differential fertility (number of surviving offspring)

Question 10

4 Modes of Selection regarding Fitness

Answer 10

• Against recessive allele
• Against dominant allele
• Against homozygotes
• Against heterozygotes

Question 11

Balancing Selection

Answer 11

Selection for heterozygotes