In addition to founder effects, the new population is often a very small population and so shows increased sensitivity to genetic drift, an increase in inbreeding, and relatively low genetic variation.
The short answer for how long does it take to become a lawyer is that in the United States it takes a minimum of three years. In order to practice law anywhere in the western world, one must pass an examination in the geographic jurisdiction that the proposed lawyer wants to practice law.
Students wishing to become attorneys often ask the question, How long does it take to get a law degree?. The answer to that question is varied depending on the path a law student chooses to take. The first step in the educational timeline starts when obtaining a bachelors degree. Law schools do not require any particular bachelor's degree at this time.