Define the terms- Genetic flow, genetic drift.

Gene:

1. The hereditary unit of an organism is called a gene.
2. Genes are passed on from the parents to their offspring.
3. The gene variants are called alleles.

Genetic flow:

1. The gene migration into or out of a population is called genetic flow or gene flow.
2. Genetic flow may introduce a new gene into a population.
3. The gene pool of a population alters by the genetic flow.

Genetic drift:

1. The alteration in the allele frequency over a generation is called genetic drift.
2. Genetic drift causes include immigration or emigration of species in a population.
3. The new population created by genetic drift may be genetically distinct from the original population.