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| Description: Hox genes have not been detected in choanoflagellates, single-celled organisms that represent the sister clade to metazoans, but they are present in all metazoans. In the vertebrate lineage (exemplified by the mouse), the entire complex has been duplicated twice, resulting in four Hox complexes. Such events have produced duplicated genes that were later co-opted to new developmental functionsHox genes have not been detected in choanoflagellates, single-celled organisms that represent the sister clade to metazoans, but they are present in all metazoans. In the vertebrate lineage (exemplified by the mouse), the entire complex has been duplicated twice, resulting in four Hox complexes. Such events have produced duplicated genes that were later co-opted to new developmental functions Bilaterians Choanoflagellates (none detected) Sponges I I I I Cnidarians - - lab pb bcd £92”; Dtd Scr ltz Amp be abd—A Adb-B vFruithy I I I I I I I I%\-I—I—I— ~ Onychophoran J—I—I—I—H—I—I—I— ‘\ Nematode CI—I—\\—I—I—\\—I—I— - 77777777777777 Priapulid I I I I I I - - - - Polychaete —I—I—I—I—I—I—I—I—I—I— LeechesI IIIIII Nemertean J—I—I—I—I—I— Flatworms H—I—I—I—I—H— Gastropod I I I I I I Brachiopod I I I I I I I I I 1 2 3 4 5 6 7 8 9 10 11 12 13 I I I I I I I I I I I- Picture Stats: Views: 59 Filesize: 341.53kB Height: 1652 Width: 2244 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48686 |