As in the last post, I'll answer some questions to understand better the stem cell's issue.
- Why did the German scientist decide to study the fruit flies at the larval stage?
Most of the scientists choose to study this type of flies because they are fast-breeding insects, so it would be easier to investigate when something in their development goes wrong. But this German scientist thought that it would be better to study the same fly, but in its larval stage, so that, even if sometimes it would be more difficult to study them, the result would be better, as it would be the same insect during it growth, so if any problem appeared, they'd know where the problem was.
- How does the mother fly activate the control genes?
She leaves chemical messages, and depending if they are in the end or in the beginning of the egg, they will develop into the tail or head of the fly.
- What is the role of control genes?
Control genes switch on dozens of other genes in the cell, and then they control the activity of other genes in time and space, and they control where and at what time some specific gene is expressed.
- Which of the two species are closer to humans?
If we compare them in terms of control genes and body plans, zebrafish would be closer to humans.
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