9C Genetic Drift & Gene Flow

Question 1

Genetic Drift’s affects and examples

Answer 1

Examples:
The founder effect occurs when a small unrepresentative sample of individuals separates from a larger population to colonise a new region and start a new population

The bottleneck effect occurs when a large portion of a population is wiped out by a random event

Effects:
Founder effect: Reduces genetic diversity through the establisment of new population with a small unrepresentative sample of the original population
Bottleneck effect: Reduces genetic diversity through the removal of alleles from random events

Question 2

Gene Flow’s affect

Answer 2

Gene flow involvees the introduction or removal of alleles between populations through either migration or interbreeding
Effects:
Immigration = increase of genetic diversity
emmigration = decrease of genetic diversity
intrbreeding = increase of genetic diversity