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| Description: (A) A normal fruit fly has large, round eyes. (B) A fruit fly with a mutation in its eyeless gene develops with no eyes. (C) Eyes form wherever the eyeless gene is expressed in fly embryos—here, on the head and wing. Humans, mice, squids, and other animals have a gene called PAX6. In humans, PAX6 mutations result in missing irises, a condition called aniridia (D). Compare a normal iris (E). PAX6 is so similar to eyeless that it triggers eye development when expressed in fly embryos. Picture Stats: Views: 13 Filesize: 1.69MB Height: 992 Width: 2176 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49111 |