A mutated copy of Src (SARC) was found in an oncovirus afflicting this organism, the Rous sarcoma virus.
This organism develops an abnormal webbed phenotype when artificially expressed Gremlin antagonizes its endogenous BMP4. Niswander et al. expressed fibroblast growth factors in this organism's distal mesenchyme to rescue mutants lacking the apical ectodermal ridge. Transplanting this organism's mesodermal cells or applying retinoic acid to its anterior margin creates mirror-image duplications that led Riddle et al. to conclude that sonic hedgehog homolog directs the zone of polarizing activity in this organism's (*) limb bud. A mutated copy of Src (SARC) was found in an oncovirus afflicting this organism, the Rous sarcoma virus. This organism is the major model for studying the microchromosomes that are typical of its small-genomed class. Studies of this organism indicate an autosomal origin of the Z and W chromosomes. For 10 points, name this model organism, a domestic avian.
This organism develops an abnormal webbed phenotype when artificially expressed Gremlin antagonizes its endogenous BMP4.
chicken [or Gallus gallus domesticus; accept hens or roosters or cockerels or Chanticleer or what have you; prompt on "birds" or "avians" or "Aves" or "dinosaurs" or "tetrapods" or other less specific answers]