eukaryotic life cycles biol 1407. life cycles asexual reproduction sexual reproduction –gametic...

Download Eukaryotic Life Cycles BIOL 1407. Life Cycles Asexual Reproduction Sexual Reproduction –Gametic meiosis –Zygotic meiosis –Alternation of Generations

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  • Eukaryotic Life CyclesBIOL 1407

  • Life CyclesAsexual ReproductionSexual ReproductionGametic meiosisZygotic meiosisAlternation of Generations

  • Asexual ReproductionWatch Video #4, binary fission in Parameciumhttp://www.microscopyu.com/moviegallery/pondscum/protozoa/paramecium/t1/paramecium04.htmlPhoto Credit: Courtesy of Richard Allen @ http://www5.pbrc.hawaii.edu/allen/

  • Gametic MeiosisDiploid multicellular organismProduces gametes by meiosisGametes = only haploid stage

  • Gametic MeiosisGametes always fuse to form zygoteZygote grows into diploid multicellular organism

  • Zygotic MeiosisHaploid multicellular organismProduces gametes by mitosisGametes always fuse to form zygote

  • Zygotic MeiosisZygote meiosis haploid spores Zygote = only diploid stageSpores grow into haploid multicellular organisms

  • Alternation of GenerationsTwo generations:Multicellular haploid organismMulticellular diploid organismLife cycle alternates between the two

  • Alternation of GenerationsMulticellular diploid organismProduces haploid spores by meiosis

  • Alternation of GenerationsSpores grow into haploid multicellular organismsHaploid multicellular organism produces gametes by mitosis

  • Alternation of GenerationsGametes always fuse to form zygote Zygote grows into diploid multicellular organism

  • Question: Which Type?

  • The EndUnless otherwise specified, all images in this presentation came from:Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.

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