Discussion : Human Variation, "Race", and DNA Testing

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This is a graded discussion: 15 points

possible

due Jul 6 at 11:56pm

Discussion #2: Human Variation, "Race", and DNA Testing 12 12

In this class, we’ve learned that human variation exists. We also know that simple

categories based on geography and phenotype--"races"--have been used to describe

people from different parts of the world. However, due to the complex, overlapping

nature of human variation (what we call clinal variation), racial categories have no

biological basis. While there are some broader phenotypic traits that are more

common within groups, cultural attitudes and beliefs form much stronger markers of

identity. Unfortunately, many people continue to believe there is a biological

distinction among different racial groups.

Interestingly, the rising popularity of individual DNA testing from companies such as

Ancestry.com and 23 and Me does not necessarily help people understand this. Many

people do not fully understand where their DNA comes from to begin with. Luckily we

have studied this fully in our section on inheritance (remember meiosis and

recombination)!

Review the following two articles for further information.

ARTICLE 1: Can you tell your ethnic identity from your DNA.pdf.

ARTICLE 2: DNA Tests - Ancestry Tests May Pose a Threat to Our Social

Fabric.pdf

Using information from the articles above and our class materials, please address

any of the following questions in an original post of at least 250 words. Include a

response post to another student.

• What percentage of your genes come from your parents? Your great-grandparents?

Your great-great-great-great-great-grandparents? Can you be directly descended

from an individual but do not have any of their DNA? Describe how. Do you think

most people know this?

• What are some of the problems with DNA testing? More specifically, what are some

of the problems associated with how ethnicity is determined using DNA? How might

it reinforce racism?

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• What are the differences between DNA ancestors (genes) and your "family tree"

(people you consider relatives)? How are each important in different ways?

• Discuss in detail another specific issue concerning DNA testing you found interesting

that relates specifically to our course.

• RECAP: For credit, you must refer to specific information from our class

material and readings above in your post. You will not see others' posts in the

discussion until you post yourself. A response post to at least one other

student is required for full credit.

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