What happens when cousins marry and breed?

In New Zealand we have laws that prevent same sex marriage, yet allow first cousins to marry. What are the odds of genetic mutation from first cousins marrying:

The inbreeding is computed as a percentage of chances for two alleles to be identical by descent. This percentage is called “inbreeding coefficient“.

Ironically the inbreeding coefficient for first cousins is 6.25% which is probably the same percentage as there are homosexuals in society.

What are the issues of inbreeding then?

A 1998 review found 1-4% increased morbidity for offsprings of first cousins compared to offsprings of unrelated parents. A 1994 review found 4.4% increased mortality for offspring of first cousins. After controlling for several sociodemographic factors, infant mortality for offspring of first cousins had odds ratios of 1.36, 1.28, and 1.32 for the neonatal, postneonatal, and infant period. There has been little research on how inbreeding affects common adult disorder although some preliminary evidence support effects on many such disorders including cardiovascular diseases and common cancers. Many previously not identified genetic disorders have first been recognized in highly endogamous communities and the mutation causing the disease may be unique to such communities.

A review of 48 studies of children born to cousins found that most of the children were healthy, with birth defects affecting 4% of births for consanguineous couples compared to 2% for the general population.

So we have laws that allow first cousins to marry and as a result have an increased risk of genetic deformities and illness. None of this happens with sam sex marriage and yet that is prevented by law?

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As much at home writing editorials as being the subject of them, Cam has won awards, including the Canon Media Award for his work on the Len Brown/Bevan Chuang story. When he’s not creating the news, he tends to be in it, with protagonists using the courts, media and social media to deliver financial as well as death threats.

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