First off, it's a generalization. Not all Africans have large noses and lips. Characteristic facial feature vary from region to region in Africa. In West and South and some parts of Central Africa, those characteristics you stated are what the majority of the Africans look like. But most East Africans, North Africans, and some Central Africans have thin noses, normal - thin lips and usually have curly hair and can have straight/wavy hair. It's not because of mixing with non-Africans, it's because Africans are a diverse people. In fact, Africans are the most diverse ethnic group, according to researchers and scientists.
In fact, many Africans, especially East Africans, tend to marry and have children with people within their country, so that their genes are concentrated. This is proved through genetics tests. The oldest fossils in the world are found in East Africa, mainly Ethiopia, which suggests that the human race began there. According to many evolution theories, as the human community grew, some migrated to other regions in Africa, to Asia and to Europe. The physical characteristics of these races are a result of mutations and climate adaption after migration. An example is white skin which was a mutation that aided the humans living in colder regions, so that their skin could absorb more vitamin D into their bodies from the sun.
As to the large noses and lips of some Africans, I'm not really sure what purpose they served as East Africans living in the same climate do not typically have these features. But there is differences in every group. It's more due to genes being kept within a gene pool (or community) because there are no new dominant genes to override these genes. Also, no one died from having these characteristics as they did not hinder their survival.
Log in to comment