I had a 98 average in biology. Maybe my textbooks differ from yours. Also, don't write me off as retarded just because my opinions don't match up to yours, whether you think you're right or not.
Cells are organisms that do a particular task for the body. They can't think or act on their own, the brain controls them, sending signals through the nervous system. Skin cells make up the skin, brain cells make up the brain. They don't get up each morning and have coffee along with you.
Did you ever think that these families traveled together for sometime. They didn't have an airport at Mt. Ararat and just take off right there. They walked. It could have easily taken years upon years for the families to even get to a separating point.