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19-Dec-2019 07:28

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To assess consanguinity, researchers give relationships an inbreeding coefficient — the higher the number, the closer the two individuals are related.

First cousins have an inbreeding coefficient of 0.0625. marriages are between people who are second cousins or closer needs to be treated with plenty of caution.

A brief reminder here, Daryn, if, like me, you get confused about who is a second cousin: It’s someone who shares a great-grandparent with you.

The first-cousin marriages you’re asking about are just one type of consanguineous relationship (that’s pronounced kon-sang-gwin-ee-uh s in case you were struggling, as I was).

Anything at or above 0.0156, the coefficient for second cousins, is considered consanguineous; that includes relationships between people and their nephews and nieces. For one thing, 25 states ban marriage between first cousins, and another seven states have restrictions on it (for example, in Arizona first-cousin marriage is allowed only if both people are 65 or older, or if one is unable to reproduce).

Those laws might make some individuals reluctant to say they are in a consanguineous relationship and result in some undercounting of relationships.

Immigration is relevant because consanguinity is much more common in some other countries.

In fact, Bittles himself first became interested in the topic during a research trip to the Indian Institute of Science in Bangalore in 1977.

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They concluded that “There is a great deal of stigma associated with cousin unions in the United States and Canada that has little biological basis.” Maybe, though, Daryn, you’re uncomfortable with the notion of a romantic relationship with a first cousin, or anyone with whom you have a high inbreeding coefficient.Hope the numbers help, Mona Have a question you would like answered here? At Bonnier Corporation, your privacy is important to us.In children born to first cousins, mortality rates are estimated to be about 3.5 percent higher.

However, Bittles notes that most research has not controlled for factors such as maternal age and education, birth spacing and socioeconomic status — those may correlate with consanguinity and may also affect health outcomes.

Before then, he was “unaware that such marriages occurred in major populations,” he told me.



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