Gilbert 9e fig 198 heterochrony in ipper development

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Unformatted text preview: ammals. Gilbert 9e, Fig. 19.8 Heterochrony in flipper development of the spotted dolphin may explain hyperphalangy Gilbert 9e, Fig. 19.8 Heterochrony is the phenomenon of expression of genes (or productino of a cell/tissue) at a different time in different species. Persistence of the AER’s signaling activity for a longer period of time may explain hyperphalangy. Snakes show differences in hindlimb AER vs. tetrapods Modern snakes don’t have forelimbs. Some snakes (e.g. constrictors such as pythons, boas, etc.) do have rudimentary hindlimbs (graspers). What about their AERs? Cohn and Tickle (1999). Nature 399, 474-479. Snake hindlimb AERs degenerate after a limb bud forms no AER The hindlimb AERs of modern snakes degenerate and cease FGF production after a rudimentary limb bud forms. Cohn and Tickle (1999). Nature 399, 474-479....
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This note was uploaded on 11/08/2013 for the course ZOOLOGY 470 taught by Professor Hardin during the Fall '12 term at University of Wisconsin.

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