Karyotype question

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prfan4life
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Karyotype question

Post by prfan4life » Sun Jun 10, 2007 3:38 pm

ok, so i am working on the lab for school, and all the chromosome pairs are there except for number 21,
so there are 44 chromosomes and it is a male..
so if there is no chromosome 21 what does that mean?
is there a disorder for this person--
if u could help that'd be great
thanx- sara

Darby
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Post by Darby » Sun Jun 10, 2007 5:51 pm

I'm close to 100% certain that if you had NO number 21's, you wouldn't live very far into early development.

An extra # 21 produces Down Syndrome, whose symptoms will give clues to the genes on that chromosome - if you had none of those genes, you'd be in major trouble.

prfan4life
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Post by prfan4life » Mon Jun 11, 2007 8:11 am

Darby wrote:I'm close to 100% certain that if you had NO number 21's, you wouldn't live very far into early development.

An extra # 21 produces Down Syndrome, whose symptoms will give clues to the genes on that chromosome - if you had none of those genes, you'd be in major trouble.


yea, so the child would still be born?, it is 44 chromosomes but the only two missing are the 21st, oh well ill make smething up-- i didnt think there was a reason as to no 21st chromosome.. thanks

david23
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Post by david23 » Mon Jun 11, 2007 7:39 pm

death before birth, which is why there are no names for a disease like this.

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kotoreru
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Post by kotoreru » Tue Jun 12, 2007 1:16 am

Hmm, yes, and gene/chromosome mutations like this are surprisingly common in humans - often thought to account for many miscarriages.
"What are humans if they don't learn at University? Animals, yes."

^^One of my ex-girlfriends said that. I stress the ex part.

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dr. dugmore
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Location: australia mate!!!!! bloody oath!! >lol<

Post by dr. dugmore » Tue Jun 12, 2007 3:21 am

thats true kotoreru, geeze your on to it :P
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LilKim
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Re: Karyotype question

Post by LilKim » Thu Jun 14, 2007 4:32 pm

prfan4life wrote:ok, so i am working on the lab for school, and all the chromosome pairs are there except for number 21,
so there are 44 chromosomes and it is a male..
so if there is no chromosome 21 what does that mean?
is there a disorder for this person--
if u could help that'd be great
thanx- sara


Monosomy 21 is not compatible with life, that child would die before brith
... There isn't a 'disease' name for that one though (that I know of).

The thing that I don't understand about your questions is that you say that there are 44Chromosomes... A normal human would have 46 ... and a fetus lacking one copy of chromosome 21 would have 45 chromosomes.... So, it seems as if you're missing another chromosome? ... (or does your patient have some kind of funky translocation. ie. Robertsonian?)

eldavid
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Rad what she is saying

Post by eldavid » Mon Jun 18, 2007 5:45 pm

The pair #21 is lost, not one chromosome.
IS necesary to know if the kariotype was taken from a living human or a fetus

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