Hypothetically answered
here (based on 28 days later apocalypse)
Quote:
If each of the two woman has a child by each of the ten men there will be 20 children, but two sets of ten half-siblings (and ten orthogonal pairs of half-siblings, one from each man). Each child would have nine unrelated potential mates. The real problems would arise later: everyone in the third generation would have four ancestors from the base population, and the same two grandfathers, making them all cousins. Even if distinct lines were kept genetically separated during the second generation the same problems would arise in the fourth generation. Inbreeding would eventually concentrate bad genes and it's doubtful that the population would survive.
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