[Veen]

I'm not an expert on this, so perhaps you could tell me if a family history of cousin marriage increases the likelihood of the recessive trait being passed by both parents. I mean, if for the last 10 generations a family has been marrying cousins to each other and introducing little variation from people outside the family, the odds are increased, right? I'd imagine cultures with a history of cousin marriage, such as the Pakistani community in the UK, are much more prone to this type of problem than when cousins marry, but none of their forbears married a cousin.

[kwhitefoot]

Yes. See, for instance,

https://www.researchgate.net/publication/8326382_Influence_o...

and for some wider background and reassurance see:

https://www.researchgate.net/publication/38114212_Commentary...