I learned that we are made of 2 trillion cells, but come from one. That one cell forms when the genetic material from the dad's sperm and the mom's egg fuse. Then the cell divides four times and forms 16 cells, which make up a blastocyst. The blastocyst implants into the mother's urethra and the embryo starts to develop. It joins the bloodstream of the mother.
They all look so similar. Different species.
Fertilization of an egg by a sperm, and formation of a blastocyst, which has 16 cells. They all clump together and stay on one side.
The three germ layers are Endoderm (inner), Ectoderm (outer), and Mesoderm (middle).
The Endoderm makes up the inner structures such as the digestive tract and glands. The Ectoderm forms the skin and the nervous system. The Mesoderm forms tissue between gut and skin, such as muscle.
This comes after the blastocyst, and it is known as a tube within a tube structure.
Another tube within a tube picture.
Human Embryo that forms.
These are called the Homeobox genes, and a fly has eight. They are mutated genes that can cause the fly to have extra wings, have a leg on its head, or miss a part of its body.
The DNA control is called the Organizer, and it determines the body plan. I think it is a chemical or something. All species have an organizer.
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