Reproduction of Unicellular and Multicellular Organisms Learning goal: Students will be able to explain why there is more variety of offspring with sexual reproduction rather than asexual reproduction. Asexual reproduction involves one parent Asexual reproduction: one parent produces one or more identical, independent offsprings • Binary fission ex. bacteria • Budding ex. hydra, potato, Kalanchoe, bamboo • Regeneration ex. starfish, roses, azaelas Asexual Reproduction and Health Bacteria reproduce asexually by binary fission. 2 = 4 = 8 =16 = 32 = 64 = 128 = 256 = 512 = 1024 Generation time: the time it takes for one generation to produce offspring *Why have some organisms evolved to reproduce asexually? so they can produce large populations quickly; so that only one individual is needed to continue a species Sexual reproduction involves two parent organisms Multicellular organisms involve sexual reproduction and asexual reproduction. • Plants from cuttings?_________ reproduction. • Plants from seeds? __________ reproduction. • Animals growing from eggs? ____________ reproduction. Cell Division Both sexual and asexual reproduction! Mitosis produces cells identical to the parent cells. The diversity of life on Earth is possible because of the combining of genetic materials from two parents in sexual reproduction. 3 functions of cell division are: growth, repair, and development. Questions to ponder? 1) What kind of asexual reproduction do most unicellular organisms use? 2) How do some multi-celled organisms reproduce asexually? 3) How is budding different in unicellular and multicellular organisms? 4) How can mitosis accomplish reproduction? 5) What are the two main differences between sexual and asexual reproduction? More Questions to Ponder? 6) 7) 8) 9) Describe the process of regeneration in starfish. How do plants use regeneration? Is the generation time of bacteria long or short? Do you think prokaryotes undergo regeneration? Why or why not? 10)What is the math term used to describe the type of growth that takes place with cell division?