These adapted traits are a very small component of the `` Homo sapiens '' genome , but include various characteristics such as skin color and nose form , in addition to internal characteristics such as the ability to breathe more efficiently at high altitudes .
These adapted traits are a very small component of the `` Homo sapiens '' genome and include such outward ` racial ' characteristics as skin color and nose shape , and internal characteristics such as the ability to breathe more efficiently at high altitudes .