19.1: The Process of Development
- Page ID
- 74610
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- 19.1.1: Embryonic Development
- The genome of the zygote contains all the genes needed to make the hundreds of different types of cells that will make up the complete animal. There are two major categories of these genes: "housekeeping" genes and tissue-specific genes. However, every cell descended from the zygote has been produced by mitosis and thus contains the complete genome of the organism (with a very few exceptions).