Does African-Americans better than Africans in their various features both physical and psychical because of the severe selection process? ?

African Americans tend to have white ancestors. If you pay attention, you can see that some of them have narrow noses, light skin and thin lips even though they identify themselves as African American. These features are adaptations to cold climates and are therefore not found in a vast majority of Africans Nevertheless there are some Africans who do show these features because DNA evidence suggest that some of the African populations also have migrants from Europe about 24,000 years ago, when Europe has a severe ice age. 

Gayle King for example is 1/3 white according to DNA tests and she looks to me more European than African as her nose and lips are more typical of Europeans. Do the European genes make African Americans better than the people in Africa?  That is debatable. Europeans do tend to have larger brains than Africans, but Europeans also tend to have more body fat under the skin, larger bra cup sizes, shorter arms and legs, a more rounded torso, more body and facial hair, and they also seem to have genetic diseases that are not commonly found in Africans. African Americans also seem to be more susceptible to diabetes, obesity and heart disease than Africans.