Causes of change L2

Question 1

What are the five agents of evolutionary change?

Answer 1

• Mutation
• Gene flow
• Non-Random mating
• Genetic drift
  -Natural selection

Question 2

Mutation

Answer 2

Change in DNA

Question 3

Gene flow

Answer 3

Migration of alleles from one population to another

Question 4

Non-random mating

Answer 4

Such as self-fertilization in flowers

Question 5

Genetic drift

Answer 5

Change in allele frequencies in a small population due to a chance event

Question 6

Natural selection

Answer 6

Selects for favourable variation

Question 7

What causes mutations and what purpose do they serve?

Answer 7

• Can be created by mutagens or mistakes
  during replication process
• Can provide genetic diversity in a species and new alleles for a gene

Question 8

What is the genetic drift bottleneck effect?

Answer 8

Catastrophic event resulting in only a few survivors in a population. Causing a change in allelic frequency for the following generations

Question 9

What is the genetic drift founder effect?

Answer 9

Few individuals from a population start a new
population with a different allele frequency than the original population