[tri-med] Re: GINA~ tri children and reporduction

----- Original Message ----- 
From: "Debbie"
> Could two full triers have a set of 6 chromosomes?  that would be 3 from
> each parent.   Often wondered that one myself...

As far as karyotypes are concerned - anything is possible and I mean
anything. But if you are asking what I think you are asking the answer is
no - we theoretically get one chromosome from each parent to make the pair.
Or to put it another way - every cell in our body has 46 chromosomes plus
two sex chromosomes - EXCEPT our gonadal cells (sperm and ova) they have 23
plus one sex chromosome (females always an x - males either an x or a y,
hence it is the male who determines a babies sex). When fertilised the two
sets of chromosomes join to make the 46 plus 2 sex chromosomes.
Using that theory though the scenario you are describing is called a
tetrasomy - 4 of the same chromosome (rather than the 6 you proposed) and
yes it happens.
OK the other cells that don't have 46 chromosomes are red blood cells - but
I am complicating things :-))

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Karen, Mum to Alex (8 years, T-18 Mosaic)
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