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Reproduction:

Reproduction:. Reproduction. Sexual Reproduction. Asexual Reproduction. The Continuity of Life. Asexual Reproduction: Genetically Identical Offspring. Budding Regeneration Parthenogenesis … Cloning???. Budding… .

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Reproduction:

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  1. Reproduction: Reproduction Sexual Reproduction Asexual Reproduction The Continuity of Life

  2. Asexual Reproduction: Genetically Identical Offspring • Budding • Regeneration • Parthenogenesis … Cloning???

  3. Budding… • New Organisms Arise as an Outgrowth from the Parent Organism • Seen Mostly in Marine Animals • Examples Include; Sponges, Corals and Jellyfish… Coral Polyp Photo courtesy Jeffrey N. Jeffords http://oceanworld.tamu.edu/students/coral/coral1.htm

  4. Regeneration… • This refers to the ability of some animals to re-grow severed parts. • Some of these animals can also grow new organisms from the severed pieces (Segmented Worms and Sea Stars)

  5. Parthenogenesis… • Offspring can arise from unfertilized eggs. • Includes some Fish, Reptiles, Amphibians and Aphids. • Most of these species can switch between Sexual and Asexual Reproduction. (depending on conditions) http://aolsearch.aol.com/aol/imageDetails?invocationType=imageResults&query=photos+of+parthenogenic+species&img http://www.duke.edu/%7Ejsr6/Hawaiipics/Rhampho.jpg http://spot.colorado.edu/~noyesr/TEACHING/4800%20Fall%202002.%20Biology%20and%20Evolution%20of%20Sex/Gynogenesis.Poecilia.pdf www.ag.ndsu.nodak.edu

  6. WHY??? • Why would these organisms prefer asexual reproduction in stable conditions and sexual reproduction in more uncertain or less favorable conditions?

  7. Imagine… • Imagine that a particular organism within a species lacks a certain gene (or ability to express a certain gene) necessary to break down a specific type of food, yet others of the same species within the population are able to break down that food. • What happens if the uncertain or less favorable conditions lead to that being the primary food source?

  8. Death… • The parent organism and all of their offspring produced through parthenogenesis would die! • But, with the genetic diversity that comes from sexual reproduction the possibility of the offspring surviving is enhanced.

  9. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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