BIOL 2299 Lecture Notes - Lecture 3: Tiktaalik, Urocyon, Giant Anteater

• School: Northeastern University
• Department: Biology
• Course: BIOL 2299
• Professor: Anestis

Document Summary

Transitional form provides link between earlier and later forms. Had broad skull, flexible neck, eyes on top of head, primitive wrist and five fingers. Could peek above water and look for prey. Biogeography: stud(cid:455) of the geog(cid:396)aphi(cid:272)al dist(cid:396)i(cid:271)utio(cid:374) of e(cid:454)ti(cid:374)(cid:272)t a(cid:374)d (cid:373)ode(cid:396)(cid:374) spe(cid:272)ies, isolated (cid:272)o(cid:374)ti(cid:374)e(cid:374)ts a(cid:374)d isla(cid:374)d g(cid:396)oups have evolved their own distinct plant and animal communities. Endemic: naturally found only in a particular location: e(cid:454): isla(cid:374)d fo(cid:454) (cid:894)u(cid:396)o(cid:272)(cid:455)o(cid:374) litto(cid:396)alis(cid:895) e(cid:448)ol(cid:448)ed f(cid:396)o(cid:373) (cid:373)ai(cid:374)la(cid:374)d g(cid:396)a(cid:455) fo(cid:454) (cid:894)u(cid:396)o(cid:272)(cid:455)o(cid:374) (cid:272)i(cid:374)e(cid:396)eoa(cid:396)ge(cid:374)teus(cid:895) Convergent evolution: t(cid:449)o diffe(cid:396)e(cid:374)t spe(cid:272)ies f(cid:396)o(cid:373) diffe(cid:396)e(cid:374)t li(cid:374)eages sho(cid:449) si(cid:373)ila(cid:396) (cid:272)ha(cid:396)a(cid:272)te(cid:396)isti(cid:272)s (cid:271)e(cid:272)ause the(cid:455) o(cid:272)(cid:272)up(cid:455) similar environments, e(cid:454)a(cid:373)ples: Giant anteater and echidna both have long snouts and tongues to feed on ants. Aerial rootlets for clinging in english ivy and wintercreeper. Antifreeze proteins in different, very cold water fish. Molecular homology: the sa(cid:373)e t(cid:455)pe of ge(cid:374)e is ofte(cid:374) fou(cid:374)d i(cid:374) di(cid:448)e(cid:396)se o(cid:396)ga(cid:374)is(cid:373)s, e(cid:454): p5(cid:1007) ge(cid:374)e pla(cid:455)s a (cid:396)ole i(cid:374) p(cid:396)e(cid:448)e(cid:374)ti(cid:374)g (cid:272)a(cid:374)(cid:272)e(cid:396)