change in allele frequency in a small population by chance not natural selection, e.g. an earthquake
WHAT IS GENETIC BOTTLENECK?
reduction of allele diversity caused by sudden reduction in population size (smaller gene pool so when population size increases, genetic diversity will still be lower)
WHAT CAN CAUSE GENETIC BOTTLENECK?
natural disaster
WHAT IS THE FOUNDER EFFECT?
reduction of allele diversity when a small group of individuals is isolated from a larger population (small group will have a smaller gene pool and lower genetic diversity than original population)
HOW TO TELL WHEN YOU SHOULD SPEAK ABOUT GENETIC DRIFT?
