Quote: Originally Posted by SirJosephPorter
But the fact that it has the full chromosome number doesn’t make it any more human than it makes an acorn same as an oak tree. An acorn has the same chromosome count as a fully mature oak tree. But it would be absurd to claim that an acorn is the same as an oak tree. It is the same with embryo and a baby.
Of course not. What makes it human is the human DNA it carries. The DNA that directs the cell movements. The DNA that directs the development of the human body plan. The DNA that directs biochemical pathways.
Did you know that the embryo has a different form of hemoglobin? Without it, and the slightly different affinity for oxygen, the embryo would die from lack of oxygen. The oxygen passes over the blood barrier in the placenta because it is attracted to the altered 3-d shape of the globin protein.
That is a direct result of our DNA. It's not unique to humans, but it's definitely a human trait. We also have gill slits at one point in our development, a result of our DNA lineage.
That is what makes it a human. It is a developing human.
Edited to add:
As to the acorn and the oak tree, this is a difference in plants. You should look into the difference between the sporophyte, and gametophyte. They are two different generations. One is a haploid, the other is the diploid. I'll leave it to you to figure out.
Last edited by Tonington; Jun 5th, 2009 at 08:27 PM..Reason: forgot the last part