One question i had always wondered about was how the creationism was to account for a sustainable gene pool. it's been proven that if too little genitic diversity is repeatedly reproduced, (i.e. one related family reproducing over and over and over, mother with father, son with daughter, so on and so on) that inbreeding and physical/health problems result. for example. if adam and eve were the ancestors of all humans, our survival rate would be crippled and we'd all be inbred. the same goes for the flood story, if there were only 2 of each animal, how could a sustainable population result? espcially with larger mammals (humans included) in breeding can result in as few as 2 generations.
inbreeding creates situations where organisms actually become LESS fit for survival, thus in dischord with what all modern research shows us. most animals avoid breeding with kin to the extreems, sometimes even with hostility to relatives. so if this is true, how is it possible to have genitically sustainable populations today if genisis/flood theory is true?