Why do all somatic cells of an organism of a given species have the same set of chromosomes

Why do all somatic cells of an organism of a given species have the same set of chromosomes, but differ in structure and functions?

Differences appear in the course of cell differentiation during embryogenesis, starting with the formation of ecto- and endoderm, and then further embryonic tissues from them. The genes regulating histo- and organogenesis are responsible for this.



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