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African American DNA Research Forum

Re: DNA Testing.....Curious
In Response To: DNA Testing.....Curious ()

>I am curious about this DNA Testing, however quite
>interested in going through with it. What is the
>actual price? Do you pay for it up front? Also, when
>doing DNA is this just on your father's side or
>both? My research on my mother's side is the House
>family as well as the Crowell family since my
>grandfather John House married my grandmother Martha
>Crowell. On the Evans family is that of my
>grandfather Joe Evans married to my grandmother Mary
> Vance.

1. Price - depends on the company you use, some around $200, others around $350. Some require payment before even sending the kit for getting the dna sample, another sends the kit and you pay when you submit the sample for testing.

2. Is it just on your father's side? - Males can test both their mother's and their father's side since they inherit both the male Y-chromosome from their father and the mitochondrial DNA (or mtDNA) from their mother.

The Y-chromosome test would be following the EVANS line back on your father's side and ONLY the EVANS line. That means none of the females on that line and only one male in each generation.

The Y-chromosome does not carry DNA material from ALL of your father's ancestors, just HIS father.

In your parents' generation, the Y-chromosome accounts for your father, nothing for your mother, so 1/2 of your ancestry is not included;

in your grandparents' generation, only your EVANS grandfather, meaning 1/4 of your ancestry included;

in your great-grandparents' generation only your EVANS great-grandfather meaning 1/8 of your ancestry is included.

As you know, for each generation you go back, you double the ancestors. On the other hand, as you go back in time through your lineage, for each generation back, you halve the fraction of your ancestry that the Y-chromosome represents. In other words, the information it can provide is limited.

3. As a male can do both tests, you can have your mtDNA tested also. This is the inheritance from your mother. And your mother's mother. And her mother's mother, back into infinity. Again, just like the Y-chromosome, this is the DNA inheritance from ONE mother out of hundreds (thousands?) of mothers in your ancestry.

Females can only test mitochondrial DNA and would need to search out male relatives to do a Y-chromosome test. Males inherit the mitochondrial DNA but do not pass it to their children. So a male may need to search out a female relative to do a mtDNA test.

For example, no parents living, none of their siblings living:

Female child:

Mother's mother's lineage - She could get the mtDNA test herself.

Mother's father's lineage - She could get her mother's brother's son tested

Father's father's lineage, she could have a brother tested. Or her father's brother's son.

Father's mother's lineage - test her father's sister's daughter.

Male child:

Mother's mother's lineage - he could get the mtDNA test himself

Mother's father's lineage - he could get his mother's brother's son tested

Father's father's lineage - he could get the Y-chromosome test himself

Father's mother's lineage - test his father's sister's daughter.

If you recall, with the Sally Hemmings/Thomas Jefferson testing, they used the descendants of Thomas Jefferson's uncle. So you may even have to resort to that, going back one generation to get a male or female line, then following that forward to find a test subject.

The Y-chromosome and mtDNA represent only about 2% of your DNA, if I remember that correctly. I almost forgot the 3rd type of test - This one tests across all of your DNA and gives you the percentage of ancestry among 4 population groups: Native American, European, African, Asian, but will not point you to a location for any of your ancestry.

The Y-chromosome and mtDNA samples are compared against a database of samples taken around the world and you will be given the location of the most nearly comparable DNA in their database. What this means is that they will tell you where a large group of people with DNA similar to yours lives today. Where they lived when your particular ancestor (many, many generations ago) lived you will not know.

What database your DNA is tested against may vary depending on the company you use, so that may determine which company you want to use.


18 Dec 2002 :: 14 Nov 2008
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