Final answer:
Genetic studies indicate that there's more genetic diversity within a given race than between different races. The statement 'Genetic variation within a given race far exceeds the variation between races.' best completes the sentence. The concept of race is not supported by genetics or statistics.
Step-by-step explanation:
The correct completion of the sentence regarding genetic variation within and between races would be: Genetic studies show that genetic variation within a given race far exceeds the variation between races. This means that there is a greater degree of genetic diversity found within a single 'race' than between different 'races'. The widest genetic variation within the human population occurs in Africa, which can be attributed to the long history and diverse environments that human populations have inhabited over many millennia. This high level of genetic diversity in Africa underscores the point that 'race' lacks a strict biological basis, and from a statistical standpoint, it fails to delineate clear, distinct groups due to the extensive overlap in genetic variation among individuals.
Race is not a valid concept from a scientific or statistical perspective. Statisticians and scientists point out that the notion of race cannot be sustained when considering the amount of genetic overlap between supposed racial groups. Despite the lack of a biological foundation, the notion of race continues to be a pervasive social reality affecting individuals worldwide, particularly in diverse societies where people have varying appearances.