Gene control

Why did the German scientist decide to study the fruit flies at the larval stage?

The German scientist decided to study the fruit flies at the larval stage so they could observe the howl growing process of the fly, so if any malfunction happened to the fly they could know where it was and why it happened.

  How does the mother fly activate the control genes?

The mother fly uses a specific chemical substance that triggers some gens of the fly; this will generate the specialization of that part of the egg. This chemical reaction trigger if that part is going to develop as a head or as a tail.

  

What is the role of control genes?

Control genes are very important because these genes are the ones that have the job of activating all the genes necessary for the growing process of the fly.

Which of the two species are closer to humans?

Zebra fish is much closer to humans than fruit fly because it has a growing process similar to the humans.