How does variation in genes generate the beautiful diversity of animal body shapes that fill the world? UCSD Biologist William McGinnis explains that all animals,...
German scientists published new work on zebrafish embryonic development. This time-lapse video shows the zebrafish from 64 cells into development to 20,000 cells.For more information,...
Even before Darwin, biologists recognized that species that looked quite different as adults often had close similarities as developing embryos. Many four -- legged animals...
