Since then, Bittles has attempted to piece together a map on the of consanguinity.
Today, the practice is highly stigmatized, partly because of health concerns about children born to first cousins.
Of the 10 cases she shared with us, five of them were Pakistani patients and all of them came from cousin marriages.
In the other 25 states permitting at least some first-cousin marriage, double cousins are not distinguished.
If we count all the persons involved in this relationship, minus the common ancestor, we find four persons involved.
The hereditary disorder causes an excessive destruction of red blood cells leading to anemia.
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Emigrants from these regions sometimes maintain these traditions.