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XYY possible?

Genetics as it applies to evolution, molecular biology, and medical aspects.

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XYY possible?

Postby student12 » Tue Aug 15, 2006 8:42 am

Is an individual having XYY possible?

In my oppinion, it isn't possible as a male only has one Y, and if this failed to seperate it can only result in XXY. Having XYY would only be possible if an abnormal sperm (XY) fertilises another sperm (Y).

Any ideas...?
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Postby weesper » Tue Aug 15, 2006 8:53 am

No XYY is very well possible; even XYYY or XYYYY is possible. Double YY is in fact linked to slight mental retardation and agressive behaviour, about 2-3% of men inside prisons display double YY on their karyotype. Hope this answers your question.
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Postby mith » Tue Aug 15, 2006 1:38 pm

I think the sperm was a YY that didn't separate correctly..followed by fertilizing a X
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Postby kiekyon » Tue Aug 15, 2006 1:55 pm

mithrilhack wrote:I think the sperm was a YY that didn't separate correctly..followed by fertilizing a X


or, 2 sperms is fertilized with an ovum
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Postby tam122 » Tue Aug 15, 2006 3:01 pm

kiekyon wrote:
or, 2 sperms is fertilized with an ovum


If an ovum is fertilized by 2 sperms, then we have twins, aren't we?

XYY is an mutation of sex chromosome in meiosis that YY didn't separate, and then fertilize with an X of the ovum
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Postby sdekivit » Tue Aug 15, 2006 3:30 pm

tam122 wrote:
kiekyon wrote:
or, 2 sperms is fertilized with an ovum


If an ovum is fertilized by 2 sperms, then we have twins, aren't we?

XYY is an mutation of sex chromosome in meiosis that YY didn't separate, and then fertilize with an X of the ovum


i'll look it up what is the cause of this so called 'supermale'.
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Postby LilKim » Tue Aug 15, 2006 8:35 pm

if 2 sperm fertilized one ovum you'd have a triploid fetus... with a sex chromosome complement that would could be XXY or XYY.
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Postby sdekivit » Tue Aug 15, 2006 8:37 pm

LilKim wrote:if 2 sperm fertilized one ovum you'd have a triploid fetus... with a sex chromosome complement that would could be XXY or XYY.


a triploid is not viable due to an imbalance in gene dosage.
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Postby LilKim » Tue Aug 15, 2006 8:42 pm

47,XYY can also be created by an early endoreduplication event (duplicating the copy of Y).
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Postby sdekivit » Tue Aug 15, 2006 8:47 pm

LilKim wrote:47,XYY can also be created by an early endoreduplication event (duplicating the copy of Y).


this perfectly viable, since there are not many genes on the Y-chromosome. So there is no genetic imbalance of the autosomal genes. Most of these males are infertile.
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Postby tam122 » Wed Aug 16, 2006 7:01 am

tam122 wrote:If an ovum is fertilized by 2 sperms, then we have twins, aren't we?



Sorry, I 'm mistaken and I have just checked it again. Thanks for your reminding
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Postby tam122 » Wed Aug 16, 2006 7:36 am

Take a look of this. It may be helful
http://www.ncbi.nlm.nih.gov/entrez/quer ... .3080#3097
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