Characteristics of Haplogroups??

[RH NEG-I]

Are there any defining physical characteristics that can be positivly associated with the various Haplo Groups?

[Mzungu mchagga]

As far as I know there are no physical characteristics caused by the Y-Chromosome, except of course for the general male characteristics. But to be more precise they are not caused by the Y-DNA itself, but by the missing second X-Chromosome which otherwise oppresses these features. Unless of course you associate Y haplogroups with certain ethnicities, so that you can say with a certain chance someone with haplogroup A is black, O suffers from lactose intolerance, I is white etc...

[RH NEG-I]

Interesting so I suppose the mdna points to more definable traits?

[Aristander]

Our general charateristics are determined by our autosomal DNA and not our mtDNA or Y DNA haplogroup. Two individuals can have identical mtDNA and Y DNA markings and look completely different as far as eye, hair and skin color, along with other physical attributes.

[RH NEG-I]

How then do these genes express themselves?

[RH NEG-I]

Arent there technological and societal advances and or changes associated with Y chromosome mutations in antiquity?

[bud]

Y DNA and mtDNA are used to trace ancestry as they are unchanged for thousands of generations. But we are all made up of thousands of Genes that contribute to our physical traits and from many relatives that are not associated with either the Y or mtDNA.

For Example I look exactly like my Scottish Mothers father but I do not have his Y DNA.

[RH NEG-I]

I understand but what exactly is the Y chromosome responsible for? It has to express itself somehow. Perhaps its a psychological thing, male identity? For instance, exposure to testosterone in the womb can determine a man's ability to read maps, problem solve, aggression, etc. Perhaps the Y chromosome plays a role? Is there any data on this? As I said before there are observed changes in civilizations that are associated with mutations in the Y chromosome.

[Aristander]

There might be some physical characteristics that are defined by certain Y groups, things like male fertility or maybe a tendancy to produce more male offspring than female offspring. There might even be some sex linked differences that are responsible for certain behavioral traits. I seem to recall a studyof a group of Dutch families had a tendency for males to be more violent than other groups. I don't know if this was linked to their Y chromesome or not but since it only seemed to be shown in the males I would assume that it did.

[Mzungu mchagga]

There might be some physical characteristics that are defined by certain Y groups, things like male fertility or maybe a tendancy to produce more male offspring than female offspring. There might even be some sex linked differences that are responsible for certain behavioral traits. I seem to recall a studyof a group of Dutch families had a tendency for males to be more violent than other groups. I don't know if this was linked to their Y chromesome or not but since it only seemed to be shown in the males I would assume that it did.

There are diseases like color-blindness or alopecia (if we call it a disease) which too only affect males. The genes linked to these diseases however are not on the Y-Chromosome, but on the sister X-chromosome. A second X-chromosome would neutralize the effect, but as males don't have one, the disease breaks though.

[LeBrok]

It's a little more complicated I suppose. Alopecia and colour blindness effects women too but to lesser degree. Go figure. :)

[Mzungu mchagga]

It's a little more complicated I suppose. Alopecia and colour blindness effects women too but to lesser degree. Go figure. :)

Yes, to be more precise it effects women too but to a much lesser degree. That proves too the disease is not directly from the Y-chromosome. Anyways there must me a sex-linked reason males are effected heavier. It is the same with behavior.

[Yorkie]

Interesting so I suppose the mdna points to more definable traits?

Those, like you and I, who have I haplogroup Ydna tend to be much better looking..

[JQP4545]

Masculinization of the brain as indicated by 2D:4D ratio could be passed down via y haplogroups. According to a study done on 1,260 Austrian individuals, 2D:4D is strongly heritable along paternal lines. This suggests a y chromosome component to fetal testosterone levels. If anyone else has more information on this please post as there are enormous implications. Masculinity is an important component of what makes you you. It affects your aggression, visual spatial abilities, athletic ability, empathy, sex drive, etc... Even though it is a small component of your DNA it would be one of the most important genes if 2D:4D and fetal testosterone is affected by your y haplogroup.