引用:
原帖由 mugen-purin 於 2009-5-18 11:14 AM 發表
isn't close family like same surname would hv chance of defect babies?
Father-daughter , mum-son, siblings have the most chance
Cousins ( same surname or not, same as far as they are "same distance" as far )
Like father's brother's daughter or mum's sister's daughter
Theoretically, they have the same chance of having defect babies ( from 2 recessive bad genes )