Is consanguineous marriage good or bad?

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Orlando M Lourenço

Dear Fahad,

In my country, Portugal, consanguineous marriage is judged to be bad. I do not know if this conviction relies on scientific or religious reasons. But I would not thing much of a marriage between an brother and a sister.

Fahd Al-Mulla

The long term effects of consanguineous marriage could be beneficial for a population! Can some one tell me why? think population genetics.