What two processes involving chance or randomness lead to an offsprings unique traits?

A founder event occurs when a small group of individuals is separated from the rest of the population, whereas a bottleneck effect occurs when most of the population is destroyed. The end result is very similar - - genetic diversity is reduced.

1. Genetic Drift is significant in small populations ...

2. Genetic drift can cause allele frequencies to change at random ...

3. Genetic Drift can lead to a loss of genetic variation with populations ...

4. Genetic drift can cause harmful alleles to become fixed.