Eukaryotic Life Cycles BIOL 1407. Life Cycles Asexual Reproduction Sexual Reproduction –Gametic...
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Transcript of Eukaryotic Life Cycles BIOL 1407. Life Cycles Asexual Reproduction Sexual Reproduction –Gametic...
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Eukaryotic Life Cycles
BIOL 1407
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Life Cycles
• Asexual Reproduction
• Sexual Reproduction– Gametic meiosis– Zygotic meiosis– Alternation of Generations
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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/
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Gametic Meiosis
• Diploid multicellular organism
• Produces gametes by meiosis
• Gametes = only haploid stage
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Gametic Meiosis
• Gametes always fuse to form zygote
• Zygote grows into diploid multicellular organism
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Zygotic Meiosis
• Haploid multicellular organism
• Produces gametes by mitosis
• Gametes always fuse to form zygote
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Zygotic Meiosis
• Zygote meiosis haploid spores
• Zygote = only diploid stage
• Spores grow into haploid multicellular organisms
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Alternation of Generations
• Two generations:– Multicellular
haploid organism– Multicellular diploid
organism– Life cycle
alternates between the two
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Alternation of Generations
• Multicellular diploid organism
• Produces haploid spores by meiosis
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Alternation of Generations
• Spores grow into haploid multicellular organisms
• Haploid multicellular organism produces gametes by mitosis
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Alternation of Generations
• Gametes always fuse to form zygote
• Zygote grows into diploid multicellular organism
![Page 12: Eukaryotic Life Cycles BIOL 1407. Life Cycles Asexual Reproduction Sexual Reproduction –Gametic meiosis –Zygotic meiosis –Alternation of Generations.](https://reader036.fdocuments.net/reader036/viewer/2022062309/5697bf8d1a28abf838c8c7d8/html5/thumbnails/12.jpg)
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Question: Which Type?
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The End
Unless otherwise specified, all images in this presentation came from:
Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.