Biology 3338A Lecture Notes - Lecture 31: Stamen, Apoptosis, Pyrazinamide
9 Jul 2016
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Whetehr you"re a chick or a mouse, the forelimb goes where you switch between hox 5/6 and between 9/10 is thoracic lumbar. The siize of these domains are in part due to ra. Different animals have ra under different regulation which controls how big these things are. A frog tadpole that is undergoing metamorphasis; growing limbs and tail dissappears. As discussed, ra activates hox genes and that"s why you ge limbs/ The timing is short for these events, once something is established you move on. Once you pass an event its difficult to go back. Devbio9e-fig-01-23-0. jpg once you decide the axis where you put your arm. But if you stick the tail in ra you get hind limb. Tail and limb aren"t necessarily part of your body axis. Main thing aobut gastrulation and neuralation is to make body axis. Limb buds, location that are in relation to hox and ra expression.
