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Eukaryotic Life Cycles

Eukaryotic Life Cycles. BIOL 1407. Life Cycles. Asexual Reproduction Sexual Reproduction Gametic meiosis Zygotic meiosis Alternation of Generations. Asexual Reproduction. Watch Video #4, binary fission in Paramecium

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Eukaryotic Life Cycles

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  1. Eukaryotic Life Cycles BIOL 1407

  2. Life Cycles • Asexual Reproduction • Sexual Reproduction • Gametic meiosis • Zygotic meiosis • Alternation of Generations

  3. Asexual Reproduction • Watch Video #4, binary fission in Paramecium • http://www.microscopyu.com/moviegallery/pondscum/protozoa/paramecium/t1/paramecium04.html • Photo Credit: Courtesy of Richard Allen @ http://www5.pbrc.hawaii.edu/allen/

  4. Gametic Meiosis • Diploid multicellular organism • Produces gametes by meiosis • Gametes = only haploid stage

  5. Gametic Meiosis • Gametes always fuse to form zygote • Zygote grows into diploid multicellular organism

  6. Zygotic Meiosis • Haploid multicellular organism • Produces gametes by mitosis • Gametes always fuse to form zygote

  7. Zygotic Meiosis • Zygote  meiosis  haploid spores • Zygote = only diploid stage • Spores grow into haploid multicellular organisms

  8. Alternation of Generations • Two generations: • Multicellular haploid organism • Multicellular diploid organism • Life cycle alternates between the two

  9. Alternation of Generations • Multicellular diploid organism • Produces haploid spores by meiosis

  10. Alternation of Generations • Spores grow into haploid multicellular organisms • Haploid multicellular organism produces gametes by mitosis

  11. Alternation of Generations • Gametes always fuse to form zygote • Zygote grows into diploid multicellular organism

  12. Question: Which Type?

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

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