00:02
Hi there.
00:03
To see which of these terms is most closely related to a germline cell, let's look briefly at the production of an embryo.
00:15
Of course, we have to start out with sex cells, sperm, and the egg, and these come together through fertilization to form the zygote, whereas the sperm only carried half the genetic material, and the egg carries half the genetic material, the zygote, the fertilized egg, carries the complete complement.
00:49
Once the zygote is formed, it is going to, the cells are going to start multiplying.
00:56
You'll get two cells, then four cells, then eight cells, continuing on until you get a ball, a solid ball of cells.
01:14
After that, an opening starts forming in the middle of that solid ball, of cells.
01:23
When that happens, what we now have is a hollow ball of cells with a fluid -filled cavity in the middle.
01:45
In other words, we have a very early embryo.
01:51
All right, and development would proceed from there.
01:55
But if we're back up here and look at our different terms, we're talking about the sperm and the egg...