Sorry if you see me silly. I am just a programmer happens to be curious about biology...
So far I understand how DNA make protein, how cell divides, how one composed of cells->tissues-> organs.
But, still a piece is missing in my knowledge.. Given the sperm entering the egg creating the first cell, and the nutrients from the mother... how do that very first single cell diversify , multiply, transform to a human of many different type of cells, tissue and organs ? Is this all the diversification and specialization of cells directed just by the "child" DNA alone ?
Also, how does DNA (along with living condition ?) decide the course of my life (making me 1m tall at 6 y.o , have my hair black, my life expectancy etc..)