GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2003-11 > 1068389753


From: "Nancy Custer" <>
Subject: Re: [DNA] Various haplotypes in one family--corection
Date: Sun, 9 Nov 2003 06:55:53 -0800
In-Reply-To: <3FAE45B5.000001.00184@computer>


>Haplogroups are mtDNA
>haplotypes are Y-DNA
>Both are different things.

No, a haplotype is the compete set of results for an individual whether
it is mtDNA or Y chromosome DNA. (Haplo means half so the DNA on any
one chromosome could be a haplotype. All chromosomes in the nucleus are
paired with one pair coming from you mother and one from your father.
Unfortunately, except for the Y chromosome, it is not possible to tell
which member of each pair came from your father and which from you
mother.) I have some information and diagrams about chromosomes and how
they are passed from parent to child at
http://www.contexo.info/DNA_Basics/chromosomes.htm. There are links from
that page to other pages about the basics of DNA for genealogists.

A haplogroup is a similar set of haplotypes. Y chromosome haplogroups
are defined by individual slowly changing single markers called SNP's
(Singe Nucleotide Polymorphism). They are measured in a different test
from the STR's (Short Tandem Repeats) commonly "counted" for genealogy.
However, using the data from current databases, researchers can "guess",
with pretty good accuracy, the haplogroup of an individual from the
pattern of his Y-STR markers. Similarly, the haplogroup of
mitochondrial DNA is actually defined by "mutations" in one reagion but
can be guessed from the patterns in the region tested for genealogy.

Ann Turner has written a much more comprehensive explanation of this at
http://archiver.rootsweb.com/th/read/GENEALOGY-DNA/2003-08/1059951199 I
did a quick summary of what she wrote in the two paragraphs above.
Please refer to her explanation for more details.

Nancy








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