Sickle Cell Anemia - balanced polymorphism 4. Animal Evolution 6. Using the example of Tay-Sachs disease, discuss the operation of genetic processes among human populations. Malaria is a blood parasite carrier by mosquitos. Malarial parasites cannot infect sickle cells.
Taxonomy is an inexact science, there is debate over how to divide living organisms into species.
The environment of a species and its adaptation to that environment. They are separated by a barrier which reduces gene flow. Differences accumulate in gene frequencies. The difference is also increased if macromutations occur. After sufficient accumulation of genetic differences, the two populations become distinct species.