Well, it is quite a large topic, so you have to resolve it yourself, but I can give you some tips how to organize your essay and how to start. At first, just write it like a diary note, make an introduction with name and add the ''chromosome'' to your name. Then just check on the Internet all the processes you need to include and rewrite it in the informal way, describing each of them like you feel it. To make it easier, divide your text on pharagraphs where each one refers to particular process. Use your imagination!