Note that they are not saying the Gypsies have any genetic similarity to the Jews. All they are saying is that Gypsy men are very similar genetically to each other, just as Jewish priests are very similar genetically to each other.") Within the H-M82 haplogroup, an identical 8-microsatellite Y chromo some haplotype is shared by nearly 30% of Gypsy men, an astonishing degree of preservation of a highly differentiated lineage, previously described only in Jewish priests.(30)"
Nothing in this study says anything about whether the Gypsies are related to the Jews. They are not compared at all. The only reason the Jews are mentioned is because similar studies have been conducted on the Jews.
This study presupposes an Indian origin, then goes fishing for genetic markers that came from India. And they find some - no surprise there, given the linguistic evidence they spent some time in India so would have interbred to some degree just as they have interbred with other Europeans more recently.
If you started with a different presupposition, e.g. an Israelite origin, or Egyptian, or Arab, or Persian, or European, and started fishing for markers that demonstrated that, you'd likely find those too, as all these groups will have interbred with the Gypsies at some point and have passed genetic markers into that population. So this study simply shows that they appear to have some Indian ancestry, among everything else, which is no surprise.
Figure 4 is very interesting. It describes how genetically similar or different the Gypsy population is to other groups. Look at the colours carefully. They are not at all similar to Indians. The black (Gypsy) genetics overlap primarily with the Middle Eastern genetics. They are as similar to Pakistanis, central Asian and Europeans as they are to a few selected Indian groups. There is absolutely no suggestion in this figure of a dominant Indian origin, if anything it contradicts that.
Figure 3: Y genetics are passed father to son, not carried by women, so allow the male ancestry to be studied. mtDNA is mitochondrial DNA, which comes from the egg cell. Everyone has it, but you only inherit it from your mother, sperm doesn't carry it. So this allows the female ancestry to be studied.
The authors have identified markers that the Gypsy population shares with Indians, in both the Y and mtDNA. The graph then shows what proportion of the population carry these markers vs which do not (ie have "other" genetics).
In all groups, mtDNA is quite mixed. In other words, many non-Gypsy women have been married over the years in all groups, giving mixed female genetics.
In the nomadic groups, a high proportion of men carry these "Indian" markers. In other words, most of these men appear to be descended from male Gypsy ancestors dating back to their time in India - few non-Gypsy men have been brought in.
But in the settled groups, many men have other genetic markers, and their ancestors likely married into the Gypsy population from outside.
So the nomadic groups have been more closed to outsiders, the settled groups have been more open.
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