However, some working individuals may feel that they do not have time to offer to their children would chose birth control methods to prevent pregnancy. Migration depends on the economy, welfare, shelter, and transportation available to a society. Mutations can even be affected by technology in the modern era due to the society's dependence on pharmaceutical drugs. Thus, genetic theory emphasizes the importance of culture as the major factor in the evolution of man. We must study man both as a biological and social organism and put together cultural as well as archeological aspects.
Selection plays the primary role in the creation of racial differences.
The differences in morphologies we observe in times past have been adaptive. However, adaptation is considered to arise due to certain types of situations and conditions. As Dr. Mcmurry stated in class, the Sickle cell gene protected some Africans from malaria. However, this is only helpful in areas where malaria is present. The development and expression of the Sickle cell gene is adaptive if there is malaria.