Originally Posted by Wikipedia;Race and Genetics
Non concordance
The most widely used human racial categories are based on various combinations of visible traits such as skin color, eye shape and hair texture. However, many of these traits are non-concordant in that they are not necessarily expressed together. For example skin color and hair texture vary independently.[2] This caused problems to early anthropologists who were attempting to classify race based on visible traits. Some examples of non-concordance include:
* There are many people in Africa and all over the world affected by albinism who have very light skin.
* Skin color varies all over the world in different populations. People from the Indian subcontinent are classified as Caucasian although most have dark skin.
* Epicanthal fold are typically associated with East Asian populations but are found in populations all over the world, including many Native Americans, Southern Africans, the Saami, and even amongst some isolated groups such as the Andamanese, which can all be explained to genetically relate more closely to one another than to other populations, even neighboring ones, due to specific migrations.
* Lighter hair colors are associated with Europeans, especially Northern Europeans, but blond hair is found amongst a limited, small number of the dark skinned populations of the south pacific, particularly the Solomon Islands and Vanuatu.