Your cells, though, really do, Inside their nuclei. Four chemicals called cytosine or C, A's adenine, guanine is G, and T Is thymine. That's roughly how the genes Instruct the cells on how to make proteins, Compounds essential to development In organisms. Twenty different Kinds of amino acids are the stuff Proteins are made of. 2 Genes dictate, then, The sequence of amino acids in Each protein, and that sequence is what makes Each protein do its special thing.
Mistakes Sometimes occur in the transcription of The code.
It also happens folks make love And reproduce, and what the latter means Is a recombination of their genes. But also to such random radiation As cosmic rays. So usually mutation Harms or is neutral. That 's natural selection. That's how besides Insects become immune to pesticides.