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In populations in which people marry within a small group, both genetic events lead to fluctuations in frequencies of genetic mutations.The DNA of those who survive continues into the future, while the DNA of those who don’t becomes extinct.
NERC has many different mechanisms to support diverse kinds of research; the first step is to decide which is most suitable for the work you want to do.We’ve all heard the generalizations and stereotypes.Moment takes a closer look at some of the persistent rumors to find out the truth.Mutations are the result of two genetic phenomena known as founder effect and bottleneck effect.A founder effect occurs when a new population emerges as a result of migration or some other cause; a genetic bottleneck, on the other hand, occurs when an already-existing population shrinks due to a cataclysmic event, such as a famine or massacre.The key to genetic similarities among people, says Risch, is not religion but endogamy—the practice of marrying within a specific group, which leads to its genetic differentiation.
“Endogamy can be tied to religion as a social phenomenon,” says Risch, but “there’s endogamy that’s not just religious.
Though the history is murky, it’s clear that all Jews originated in the Eastern Mediterranean, and that over centuries some migrated. “There’s not a lot of actual history written down, but the belief is that the Ashkenazis derived from settlers who probably came into the Rhineland around the 9th or 10th century and formed this distinct endogamous group.” The 14th-century founder effect was likely also the result of immigration, largely to Lithuania and the surrounding region.
MYTH ASHKENAZI JEWS HAVE HIGHER IQS MAYBE A 2005 study by a team of three anthropologists at the University of Utah argued for an attention-grabbing premise: that the genes that caused four typically Ashkenazi diseases (Tay-Sachs, Gaucher, Niemann-Pick and mucolipidosis type IV) were so prevalent because they were also linked to increased intelligence, an evolutionary benefit for Jews who typically held occupations that demanded mental acuity.
The clues are not genes, but mutations that are found in higher frequency in some groups than in others.
These mutations largely occur in parts of the DNA with no specific function, but they can lead to diseases such as Tay-Sachs or dysautonomia.
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