All of the following statements support the hypothesis that...

All of the following statements support the hypothesis that humans cannot be classified into biological races except: A. There is more genetic diversity within a racial group than average differences between racial groups; B. Alleles that are common in one population in a racial group may be uncommon in other populations of the same race; C. Geneticists can use particular SNP alleles to identify the ancestral group(s) of any individual human; D. There are no alleles found in all members of a given racial group; E. There is genetic evidence of mixing among human populations occurring thousands of years ago until the present.

All of the following statements support the hypothesis that humans cannot be classified into biological races except:
A. There is more genetic diversity within a racial group than average differences between racial groups; B. Alleles that are common in one population in a racial group may be uncommon in other populations of the same race;
C. Geneticists can use particular SNP alleles to identify the ancestral group(s) of any individual human; D. There are no alleles found in all members of a given racial group;
E. There is genetic evidence of mixing among human populations occurring thousands of years ago until the present.

Key Concepts

Within-Population Genetic Variation

This concept refers to the observation that the genetic differences among individuals within a single population are often greater than the differences between populations. This explains why grouping based solely on external phenotypic or geographic criteria does not capture the true complexity of human genetic diversity, in effect contradicting the notion of rigid biological races.

Allele Frequency Variation

Allele frequency variation describes how common or rare specific genetic variants are within and across different populations. It shows that the distribution of alleles is not uniform across populations, and that many alleles typical of one group may be present at lower frequencies in another. This concept undermines the idea of clear, discrete racial categories based solely on genetics.

Genetic Admixture and Gene Flow

Genetic admixture refers to the mixing of genetic material from different populations through interbreeding, while gene flow is the transfer of genetic variation between populations. These processes demonstrate that human populations have been continuously interbreeding over time, leading to blurred genetic boundaries and further disputing the concept of sharply defined biological races.

Ancestry Informative Markers

Ancestry informative markers are specific genetic variations, such as certain SNP alleles, that can indicate an individual’s ancestral origins. Although these markers can be used to infer ancestry and trace lineage, they do not support a rigid classification into distinct biological races. Instead, they highlight the complexity and continuous nature of human genetic variation.

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