Nucleotide divergence rates probably more accurate Lack of older fossils due to small size and soft bodies of early animals of most body plans Mechanism for Rapid Macroevolution "HOX" genes Multiple copies in genome, more copies in more complex animals Regulate embryonic development Small changes in rates or durations of morphogenetic processes can have major effects on body plans See American Scientist Article What caused the accelerated rate?
(more copies in more complex animals; Regulate; embryonic development Small changes in rates or durations of morphogenetic processes) Context(more copies in more complex animals Regulate,List([217, 261))):(HOX" genes; Multiple; copies in genome) (American Scientist Article; caused; the accelerated rate)
more copies in more complex animals Regulate,List([217, 261))
more copies in more complex animals HOX" genes American Scientist Article
Regulate Multiple caused
embryonic development Small changes in rates or durations of morphogenetic processes
copies in genome
the accelerated rate