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Learning Objectives Describe the various methods of protist locomotion. Describe how protists reproduce.
Protists Motion: Amoeboid Movement
• Move by changing shape• Use cytoplasmic projections called pseudopods
Pseudopod
Protist Motion: Flagella
Motion by some flagella is like the back-and-forth movement of a single long oar at the back of a boat, propelling it forward.
Flagellum
Protists Reproduction: Cell Division
Amoebas and many other protists produce new individuals through mitosis.
Protist Reproduction: Conjugation
Macronucleus
Micronucleus Micronucleus undergoes meiosis.
Three micronuclei disintegrate.
Remaining micronucleusundergoes mitosis.
Protist Reproduction: Conjugation, cont.
Cells exchange one micronucleus.
Micronuclei fuse; macronucleus disintegrates.
New macronucleus forms from
micronucleus.
Diploid
Alternation of Generations: Sexual Stage
Male reproductive structure
Female reproductive structure
Zygotes
Fertilization
Meiosis
Egg cell
Male nuclei
2N