Chicks develop rapidly and are amenable to genetic and physiological manipulations, allowing researchers to investigate developmental pathways down to the cell and molecular levels.
We had a sperm and an egg. Let me draw the sperm. So you had the sperm and then you had an egg. Maybe I'll do the egg in a different color. That's the egg, and we all know how this story goes.
The sperm fertilizes the egg. And a whole cascade of events start occurring. The walls of the egg then become impervious to other sperm so that only one sperm can get in, but that's not the focus of this video.
The focus of this video is how this fertilized egg develops once it has become a zygote. So after it's fertilized, you remember from the meiosis videos that each of these were haploid, or that they had-- oh, I added an extra i there-- that they had half the contingency of the DNA.
As soon as the sperm fertilizes this egg, now, all of a sudden, you have a diploid zygote.
Let me do that. So now let me pick a nice color. So now you're going to have a diploid zygote that's going to have a 2N complement of the DNA material or kind of the full complement of what a normal cell in our human body would have.
So this is diploid, and it's a zygote, which is just a fancy way of saying the fertilized egg. And it's now ready to essentially turn into an organism.
So immediately after fertilization, this zygote starts experiencing cleavage. It's experiencing mitosis, that's the mechanism, but it doesn't increase a lot in size.
So this one right here will then turn into-- it'll just split up via mitosis into two like that. And, of course, these are each 2N, and then those are going to split into four like that. And each of these have the same exact genetic complement as that first zygote, and it keeps splitting.
And this mass of cells, we can start calling it, this right here, this is referred to as the morula. And actually, it comes from the word for mulberry because it looks like a mulberry. So actually, let me just kind of simplify things a little bit because we don't have to start here. So we start with a zygote.
This is a fertilized egg. It just starts duplicating via mitosis, and you end up with a ball of cells.
It's often going to be a power of two, because these cells, at least in the initial stages are all duplicating all at once, and then you have this morula. Now, once the morula gets to about 16 cells or so-- and we're talking about four or five days.
This isn't an exact process-- they started differentiating a little bit, where the outer cells-- and this kind of turns into a sphere. Let me make it a little bit more sphere like. So it starts differentiating between-- let me make some outer cells.
This would be a cross-section of it. It's really going to look more like a sphere.A candle for Christmas December 20, Musings posts items of historical interest from time to time.
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This video review of chick development begins by describing the process of egg fertilization and formation within the chicken reproductive tract.
Next, the most commonly used chick staging nomenclature, the Hamburger Hamilton staging series, is introduced. The Center for Assisted Reproduction (CARE) is an independent fertility center providing comprehensive medical care.
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