BIOL 1202 Chapter : Hybridization
Document Summary
Hybrid zones provide opportunities to study factors that cause reproductive. Possible outcomes for hybrids: figure 24. 14 example of stability in hybrids, figure 24. 13. The breakdown of reproductive barriers: fusin: figure 24. 16. The origin of a new plant species by hybridation, coupled with accidents during nuclear division, is an example of __: allopatric speciation, allopolyploidy- make a new species, increase the number of chromosomes. Add up the chromosomes: autopolyploidy, hybrid inviability. Conditions on early earth: atmosphere, co2; ch4; nh3; h2s;h2o, no free oxygen, abundant energy to dive reactions, frequent storms with much lightening, frequent volcanic eruptions, frequent meteor impacts, uv light from the sun. Testable hypotheses explaining the origin of life: 1. Abiotic synthesis of small organic molecules: 2. First organics compounds may have been synthesized near hydrothermal vents: extraterrestrial origin (meteorites, bring organic material) Abiotic synthesis of polymers: small organic molecules polymerize when they are concentrated on hot sand or clay.
