Re: [Slovak-World] degrees of relationship and DNA

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• Interesting . . . thank you for sharing . . . the part about partners and shared lifestyles caught my eye in particular. Caye ...
Message 1 of 4 , Dec 29, 2004
Interesting . . . thank you for sharing . . . the part
about partners and shared lifestyles caught my eye in
particular.

Caye

--- "J. Michutka" <jmm@...> wrote:

> Thought I'd pass on this little tidbit, since many
> of us are doing family
> genealogies and finding Slovak cousins who are
> related by various
> degrees. The article from which this comes is about
> cancer and
> heredity....but the line that caught my attention is
> the degrees of
> relatives and the amount of DNA in common. (I
> assume that by "x per cent",
> they actually mean "up to x per cent". Dr. Q, am I
> right?)
>
> Since I'm my own fifth cousin, I'm still trying to
> figure out the
> implications of this for me..... :-)
>
> Julie Michutka
> jmm@...
> ******************
> From
> http://in.rediff.com/news/2004/dec/28cancer.htm :
> Many cancers hereditary, says study................
> A first-degree relative is a parent or child or
> sibling who shares 50 per
> cent of an individual's DNA. Fifth-degree relatives,
> such as
> great-great-great grandparents, share 3.125 per cent
> of DNA with the patient.
>
>
>

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• Michelle is correct. The percentages are a simple mathematical progression of 1/(2^n) so for the fifth generation 2^n becomes 2^5 (two to the fifth power) =
Message 2 of 4 , Dec 29, 2004
Michelle is correct. The percentages are a simple
mathematical progression of 1/(2^n) so for the fifth
generation 2^n becomes 2^5 (two to the fifth power) =
32; 1/32 = 0.003125 = 3.125%. This is the percent of
each great great great grandparent's DNA a fifth
generation person is made up of.

Dr. "Q"

wrote:

> Julie wrote:
>
> >....but the line that caught my attention is the
> degrees of
> >relatives and the amount of DNA in common. (I
> assume that by "x per cent",
> >they actually mean "up to x per cent". Dr. Q, am I
> right?)
>
> I wouldn't think so. "Up to" means that someone
> with less than the
> percentage noted would still count as an "
> 'n'th-degree". A biological
> parent supplies 50% of the child's DNA, not more,
> not less. The 5th
> degree relative does not become a parent simply
> because 3.125%
> counts as "up to" 50%.
>
> >******************
> > From
> http://in.rediff.com/news/2004/dec/28cancer.htm :
> >Many cancers hereditary, says study................
> >A first-degree relative is a parent or child or
> sibling who shares 50 per
> >cent of an individual's DNA. Fifth-degree
> relatives, such as
> >great-great-great grandparents, share 3.125 per
> cent of DNA with the patient.
>