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Sex Linkage in humans - HSN forum

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Sex Linkage in humans


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#1 Nathan

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Posted 16 March 2006 - 07:36 PM

I've got my NAB tomorrow and im going over my content statements at the mo and ive come across

QUOTE
Name two sex-linked characteristics in humans


does this mean like colour blindness or does it mean something else?

and if it does mean colour blindness, etc, could someone please tell me another condition that is sex linked

thanks wink.gif

#2 xo!_kirsty_!xo

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Posted 16 March 2006 - 08:08 PM

QUOTE(nathanm @ Mar 16 2006, 07:36 PM) View Post

I've got my NAB tomorrow and im going over my content statements at the mo and ive come across

QUOTE
Name two sex-linked characteristics in humans


does this mean like colour blindness or does it mean something else?

and if it does mean colour blindness, etc, could someone please tell me another condition that is sex linked

thanks wink.gif


that does mean things like colour-blindness but you have to specific about the colours, e.g. red-green colour blindness, and another sex-linked trait is haemophilia. hope that helps! smile.gif

#3 Isla from Banff

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Posted 16 March 2006 - 08:29 PM

so is sickle-cell anemia another sex-linked thing or am i talking rubbish?

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#4 Nathan

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Posted 16 March 2006 - 09:29 PM

i think its sex linked

#5 The Wedge Effect

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Posted 16 March 2006 - 10:28 PM

I know f*** all about Biology, but I have heard of Sickle-Cell Anaemia, and that is sex-linked, I think...if sex-linked is another name for hereditary...

#6 John

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Posted 17 March 2006 - 03:04 PM

Sex-Linked would be to do with diseases that are only contracted by one sex i think.

EDIT: a quick google search pretty much said the same as i thought

With Haemophilia, the female carries the gene, but only the male contracts the disease if that's any help.

btw i have never done SG or Higher (Human) Biology

Edit: this may be of interest http://www.biologymad.com/master.html?http...inheritance.htm

#7 John

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Posted 18 March 2006 - 12:11 PM

Correction to the Haemophillia sex linkage

Females can contract the disease.

More Details Here

#8 werlop

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Posted 18 March 2006 - 01:10 PM

So what does sex-linked inheritance actually mean?

Well, because the Y chromosome in males is different from the X along most of its length, males are effectively haploid for X-chromosome genes, and as a result , recessive traits carried on the X tend to be more commonly expressed in males. Also because inheritance of a gamete containing a Y chromosome confers maleness, all males get their X-chromosomes from their mothers, whereas females can inherit and X chromosome from their fathers as well.

Certain types of colour blindness as well as haemophillia are sex linked.

As for Sickle cell anaemia, heamoglobin (Hb) is a tetrameric conjugated protein (2 alpha and 2 beta chains) along with iron in the Fe(II) oxidation state. When oxygen binds to Hb it binds in a cooperative manner leading to a sigmoidal binding curve, this is the result of the protein changing configuration upon binding oxygen (T to R transition). A mutation in the beta globin gene results in what should be a glutamic acid being subsitued by a valine residue realding to HbS and the consequences that we are all familiar with.

Sickle cell anaema is not sex linked, rather it is an autosomal recessive mutation. Individuals who inherit this gene often have increased resistance to malaria.
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#9 John

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Posted 18 March 2006 - 02:15 PM

I was wondering when you would come along and destroy my interest in this topic.

I thank you for that lol





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