BIOL 1030 Chapter Notes - Chapter 32: Ediacaran, Hox Gene, Cambrian Explosion

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1030
• Professor: Scott Kevin

Document Summary

Overview: welcome to your kingdom: biologists have identified 1. 3 million living species of animals, estimates of the total number of animal species run far higher, from. In more complex animals, the hox gene family underwent further duplication. In bilaterians, hox genes regulate patterning of the anterior-posterior axis: the same conserved genetic network governs the development of a large range of animals. 1. 5 billion years ago: similar studies suggest that the common ancestor of living animals lived 1. 2 billion to 800 million years ago, the common ancestor was probably a colonial flagellated protist and may have resembled modern choanoflagellates. Ediacara hills of australia: ediacara fauna consist primarily of cnidarians, but soft-bodied mollusks were also present, and numerous fossilized burrows and tracks indicate the presence of worms. The new predator-prey relationships that emerged in the cambrian may have generated diversity through natural selection: predators acquired adaptations that helped them catch prey, prey acquired adaptations that helped them resist predation.