chapter 3 handy genes

DNA is important in this chapter. We see it playing a big part in this chapter, it helps reveal the inner fish. Its amazing seeing the many processes and experiments we can do with genes and DNA. Making hands was very intersting. I saw how you can change the development and with ZPA. You can put a pinky out or remove a thumb. You can experiment in many ways. The egg cases were so interesting. I liked learning the process and what they did as experiments. When they did the skates experiment, I realized how many times you must test to get results. finally they reached what they were looking for, the sonic hedgehog. Limbs and fins relate, and the sonic hedgehog proved that. i enjoyed reading this chapter very much.