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African American DNA Research Forum

Re: dna tests
In Response To: Re: dna tests ()

>I guess i should get tested for both sets of
>parents. get myself tested to follow my fathers
>sister to her mother, and have my brother tested to
>follow my father's father.

Testing you will not get your father's mother's lineage. It will be your mother's lineage, the only one you as a female can test for yourself. Actually, if you and your brother have the same mother and the same father, he can be tested for both your mother's lineage (mtDNA testing) and your father's lineage (Y-chromosome testing).

>now my question that i need to get in my head is if
>i test myself will I need one of my cousins to take
>the test with me as long as we are all blood
>relatives.

It depends on what line you are trying to test for. As I said, your brother can be tested for lineages for your father's father and your mother's mother. Testing yourself would not add anything since that would also be the lineage of your mother's mother.

Now to get the lineages for your father's mother and your mother's father, this is where cousins come in. But they need to be related to you in a specific way, not just "blood relatives."

I have female first cousins on my mother's side. Their father was my mother's brother. Testing them (mtDNA testing) will produce THEIR mother's lineage, nothing from my uncle, so that adds nothing to MY lineage information.

Testing male first cousins on my mother's side, however, IS useful. In fact, I tested my mother's nephew, the son of her brother, to get the lineage of my mother's father, because my parents and all of their siblings are deceased.

>on my mothers side, i only have second cousins
>living. will that work?

It depends. Exactly how are these cousins kin to you? How are their parents related to you? What line would you use these cousins to test for? For example, if it's a grandparent? Which one, and how does that cousin relate to that grandparent?

Here's what you look for:
For Y-chromosome testing for your grandfather, you must have a male to male descent from the grandfather to the test subject.

For example: My mother's brother's son (person tested), to my mother's brother to my mother's father to my mother's grandfather (the person whose lineage I wanted), which is as far back as I have researched.

For mtDNA testing for your grandmother, you must have a female to female descent from the grandmother to the test subject, who can be male or female.

For example: My father's sister's granddaughter, to my father's sister's daughter, to my father's sister, to my father's mother, which is as far back as I have researched.

I am hoping to test a 3rd cousin to get a lineage for my great-great-grandmother on my mother's father's side. Her great grandmother and my great grandmother were sisters. Hers is a female-to-female descent from our great-great grandmother, while mine is not.

So distant cousins can be useful if the relationship is plotted out correctly.


18 Dec 2002 :: 14 Nov 2008
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