LIFESCI 1 Lecture Notes - Lecture 20: Convergent Evolution, Nematode, Cell Potency
Document Summary
Why are there differences between the two. Ferns and slightly different than mosses because they are in different environments. Angiosperms: the fact that they have flowers} advantage. Most of the species from today originated from this radiation. Sponges, jellies, mollusks, arthropods began during the cambrian explosion. Obtain necessary carbon compounds from other organisms. Most ingest their food rather than absorbing it. Move under their own power at some point in livecycle. Cephalization: concentration of nervous system components at one end of the body. Chemoreceptors: the basis for the senses of smell and taste. Detect oxygen, carbon dioxide, glucose, amino acids. Trail ants: pheromones that the other colony ants can sense. Mating: when the female is receptive to reproduce, male will locate it. Mechanoreceptors: respond to touch, stretch, pressure, sounds. Shrimp and humans: sensory mechanisms that help determine 3d position. Cilia inside inner ear: sends message to brain.
