PSYC 2000 Lecture Notes - Lecture 33: Wisdom Tooth, Convergent Evolution, Divergent Evolution
Document Summary
Homologous structures: come from common ancestors, different due to diff environments (divergent evolution) Fossil record gives us more simpler explanation that birds developed wings on their own and insects developed wings on their own- developed them so that they could not be eaten and get food (analogous structure) Convergent evolution bc of similar selective forces. Similar environmental forces select for similar structures in unrelated organisms. Analogous structure bc the animal as a whole has common ancestor, but the structure developed on its own. Advantageous: more food so healthier person; can get removed now. Disad(cid:448)a(cid:374)tageous: (cid:272)a(cid:448)ity; (cid:272)ould(cid:374)"t get the(cid:373) re(cid:373)o(cid:448)ed (cid:271)a(cid:272)k the(cid:374) Rudimentary form of an organ more fully formed in ancestor. Human vestigial structures: appendix, body hair, wisdom teeth, thirteenth rib, (cid:272)er(cid:448)i(cid:272)al ri(cid:271), ear (cid:894)dar(cid:449)i(cid:374)"s poi(cid:374)t(cid:895), fifth toe, fe(cid:373)ale (cid:448)as defere(cid:374)s (cid:894)epophoro(cid:374)(cid:895), (cid:373)ale uterus, (cid:373)ale (cid:374)ipples .
