PSY352H5 Lecture Notes - Lecture 2: Wisdom Tooth, Gene Duplication, Neural Tube
Document Summary
Features of hu(cid:373)a(cid:374)s that de(cid:373)o(cid:374)strate so(cid:373)ethi(cid:374)g is(cid:374)"t right: appendix: used to be part of the gi system and eventually shrunk. We always believe that evolution is a progress from the less good to the better (how a species has gotten better after evolution). It is simply adaptation to local conditions that change randomly from time to time. Evolution is directionless and does not demonstrate progress on a linear scale. Stephen gould: organisms do not inevitably become more complex: bacteria have been around for 3 by, and have not changed in complexity up to today. The biomass (total material) is more than every other living creature combined (including forests, plants, animals in the ocean, etc). 10-15% of our weight comes from healthy bacteria within our bodies. Two ways we can adapt: add something to existing system to change, or remove something to existing system to change.
