Earth Sciences 1083F/G Lecture Notes - Lecture 17: Cyanobacteria, Aerobic Organism

• School: Western University
• Department: Earth Sciences
• Course: Earth Sciences 1083F/G
• Professor: Cameron Tsujita

Document Summary

Lecture 17 evolution of sex and rise of eukaryotes y two types of organisms : prokaryotes: lack a true nucleus. derived from greek pros meaning before and karyon meaning nut (referring to the nucleus: eukaryotes: have a true nucleus. mitosis: replication of genetic material and splitting for form 2 identical daughter cells. Sexual reproduction: asexual: mutation and errors in code transcription, sexual: mutation, errors in code transcription, crossing or trading of genetic material between chromosome pairs, splitting and recombination of genetic material. ensures lots of variation and change by natural selection y origin of the nucleus: probably not too difficult for first eukaryote, produced by infolding of the cell membrane, engulfing the genetic material. most basic idea y why do we have plants and animals: lies in the types of organelles eukaryotes possess, animals and plants have mitochondria. provide cells with energy to move, divide and produce secretory products.