BIOL 1001 Chapter Notes - Chapter 9: Vestigiality, Sickle-Cell Disease, Fair Use

• School: York University
• Department: Biology
• Course: BIOL 1001
• Professor: Alexander Mills

Document Summary

Inertia: even though dvorak is more efficient but there are too many steps, you"re committed to. If the individuals in the tails have lower fitness, then the. Cannot get to the higher fitness, because it goes downhill and favours low. Fitness individuals in order to eventually reach a higher fitness. Natural selection limitations: the e(cid:454)er(cid:272)ise (cid:449)e just re(cid:448)ie(cid:449)ed is a(cid:374) e(cid:454)a(cid:373)ple of (cid:858)phylogenetic inertia", a phylogeny is an evolutionary history. Cannot get to the higher fitness, because it goes downhill and. Favours low fitness individuals in order to eventually reach a higher fitness. Intervening stages are lower fitness therefore the "ball" cannot leave the a peak. Examples of phylogenetic inertia: vestigial structures, imperfect structures. Cave salamanders live in pitch dark, making vision useless. They have no eyes, but they continue to make eye sockets. Vestigial structures are cases of phylogenetic inertia : (cid:271)e(cid:272)ause ge(cid:374)es fro(cid:373) the past are i(cid:374)flue(cid:374)(cid:272)i(cid:374)g prese(cid:374)t phe(cid:374)ot(cid:455)pes.