Rizzo+lect13

Rizzo+lect13 - iversity in eukaryotic microbes •...

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Unformatted text preview: iversity in eukaryotic microbes: • Morphology (unicellular, multicellular) • Locomotion (flagella, cilia, pseudopods) • Metabolism (autotrophs, heterotrophs) • Symbioses (endosymbioses, parasites) • Reproduction (sexual, asexual) • Importance to humans (pathogens, landscapes) Asexual reproduction is: 1. reproduction without the fusion of gametes 2. reproduction without the influence of mutations 3. reproduction without meiosis 4. reproduction without mitosis 5. Both choices 1 and 2 6. Both choices 1 and 3 7. Both choices 2 and 3 Asexual Reproduction • The formation of one or more individuals from the genetic material of a single individual Asexual Reproduction • Binary fission —equal splitting; mitosis followed by cytokinesis. • Multiple fission —splitting into more than two cells. • Budding —outgrowth of a new cell from the surface of an old cell. • Spores —specialized cells that are capable of growing into a new individual. sexual reproduction Spores Sexual reproduction • Is the formation of new individuals by the fusion of two haploid nuclei • Alternation of generations – A diploid spore-forming organism gives rise to a haploid gamete-forming organism – When haploid gametes fuse a diploid individual is formed. – Both stages multicellular and undergo mitosis Ulva Isomorphic alternation of generations Alternatives to alternation of generation: • Diplontic: every cell but the gamete is diploid (e.g., animals) • Haplontic: every cell but sporocyte or zygote is haploid Haplontic life cycle Ulothrix Many aspects of diversity in...
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Rizzo+lect13 - iversity in eukaryotic microbes •...

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