BIOL 1050 Lecture Notes - Lecture 2: Viviparity, Zygote, Endosperm

• School: University of Guelph
• Department: Biology
• Course: BIOL 1050
• Professor: Dr.Eric Lyons

Document Summary

Primary root replaced by adventitious roots (quickly replaced with roots that arise from the stem) Primary root can persist (tap root) primary root goes to the stem. Sexual reproduction: pla(cid:374)ts ha(cid:448)e a p(cid:396)o(cid:271)le(cid:373): they a(cid:396)e(cid:374)"t (cid:373)o(cid:271)ile, the sporophytes cannot move around to find a mate, they have adapted various strategies, to move male gametes around, to disperse seeds (fruits) Callose: beta 1,3 linkages molecule forms a helix. Cellulose: beta 1,4 linkages linear polymer. Pollen wide array of types and sizes: can identify species from pollen, species specific, range from 0. 006mm to over 0. 1mm, out coating (exine) consists of different patterns and composed of sporopollenin. Sporopollenin: co(cid:373)pou(cid:374)d o(cid:374) outside of polle(cid:374) (cid:894)u(cid:374)k(cid:374)o(cid:449)(cid:374) (cid:271)/(cid:272) (cid:272)a(cid:374)"t (cid:271)e (cid:271)(cid:396)oke(cid:374) do(cid:449)(cid:374)(cid:895, extremely resistant to degradation, physical, biological, and chemical degradation, helps protect pollen in harsh environments, among most chemically inert polymers, unknown composition, likely diverse and multicomponent.