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ASexual Reproduction Lesson

ASexual Reproduction Lesson - Reproduction The Continuity...

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Unformatted text preview: Reproduction: The Continuity of Life Reproduction Sexual Reproduction Asexual Reproduction Asexual Reproduction: Genetically Identical Offspring • Budding • Regeneration • Parthenogenesis … Cloning??? Budding… Budding… New Organisms New Arise as an Outgrowth from the Parent Organism Parent Seen Mostly in Seen Marine Animals Marine Examples Include; Examples Sponges, Corals and Jellyfish… Jellyfish… Coral Polyp Photo courtesy Jeffrey N. Jeffords http://oceanworld.tamu.edu/students/coral/coral1.htm Regeneration… Regeneration… This refers to the This ability of some animals to reanimals grow severed parts. Some of these Some animals can also grow new organisms from the severed pieces (Segmented Worms and Sea Parthenogenesis… Parthenogenesis… Offspring can arise Offspring from unfertilized eggs. eggs. Includes some Fish, Includes Reptiles, Amphibians and Aphids. and Most of these Most species can switch between Sexual and Asexual Reproduction. http://aolsearch.aol.com/aol/imageDetails? invocationType=imageResults&query=photo s+of+parthenogenic+species&img http://spot.colorado.edu/~noyesr/TEACHING/ 4800%20Fall%202002.%20Biology%20and %20Evolution%20of %20Sex/Gynogenesis.Poecilia.pdf http://www.duke.edu/ %7Ejsr6/Hawaiipics/Rhampho.j pg www.ag.ndsu.nodak.edu WHY??? WHY??? Why would these organisms prefer Why asexual reproduction in stable conditions and sexual reproduction in more uncertain or less favorable conditions? uncertain Imagine… Imagine… Imagine that a particular organism within Imagine 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 What favorable conditions lead to that being the primary food source? Death… Death… The parent organism and all of their The offspring produced through parthenogenesis would die! But, with the genetic diversity that comes But, from sexual reproduction the possibility of the offspring surviving is enhanced. the 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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