The repeated dark and light pattern you are able to see the side of the embryo is brought on by the existence of somites. (charge: Flickr consumer Lunar Caustic)
There is a tiny problem in mathematics that is so evident that many biologists do not wind up thinking about it as a issue. Mice and humans (along with most other mammals) make pretty much exactly the identical selection of things since they grow from a fertilized egg. Plus they do this with a near-identical pair of enzymes. But mice do everything in 21 times; it requires people over 10 times more time to perform it.
You may attempt to ascribe this to another variety of cells, however as you go upon the form of mammals, none of that lines up. Matters get more confusing once you attempt to account for items like reptiles and birds, which likewise use exactly the very exact genes to create lots of the very exact things. The math simply does not work out. How can developing organisms figure out how to consistently balance mobile number, growth time, and also a static system of genes?
Biologists are only beginning to figure out that, and two newspapers published this week indicate some significant advancement within the specialty.
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