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Asexual Reproduction
Ms. Zimmerman 7th grade science
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REVIEW!
• What is reproduction? What’s the point?• Stand up/Sit down– Stand up if it’s ASEXUAL– Sit down if it’s SEXUAL
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Involves two parent organisms
SEXUAL
So how many parents are there in ASEXUAL?
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Your human mom or dad is a single parent
SEXUAL
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The offspring are exact clones of its parent
ASEXUAL
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The genes get weaker from generation to generation
SEXUAL
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Strength in variety of offspring
SEXUAL
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The species is not very good at resisting disease
ASEXUAL
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Asexual vs. Sexual
• when offspring are produced from a single parent, it is called asexual reproduction
• the offspring are identical to the parent!
• By cell division, one cell divides to become two.
• Used by simple organisms, such as protozoans, to reproduce.
• In some multicellular organisms, this process is used to grow in size or to replace tissues.
• when offspring are produced from two parents, it is called sexual reproduction
• the offspring is a combination of the two parents
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Kinds of Asexual reproduction
• Binary Fission• Budding• Sporulation• Regeneration• Vegetative Propagation
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Asexual Reproduction
• carried out by unicellular organisms, many lower animals, and many plants
• offspring are identical to the parents• the process is usually rapid and
results in a large number of offspring• there are several types of asexual
reproduction
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Vocab
• Genes• Clone• Offspring• Cell division
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Kinds of Asexual reproduction
• Binary Fission• Budding• Sporulation• Regeneration• Vegetative Propagation
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Binary Fission• the equal division of nuclear material
and cytoplasm resulting in 2 new organisms
• Video: http://youtu.be/gEwzDydciWc
Your cells are doing this RIGHT
NOW!!!
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Budding - unicellular
• similar to binary fission BUT has an unequal division of cytoplasm; offspring is smaller than the parent
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Budding - multicellular
• a bunch of cells form a smaller organism on the original if conditions are favorable
• the bud develops into a fully functional organism which may or may not detach from the parent
• Video: http://youtu.be/489CSop00sY
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Sporulation
• spores are single, specialized cells that are released from the parent and can develop into new individuals if the conditions are right
• occurs in molds and mushrooms
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Regeneration
• A) of body parts– new tissues can be produced to replace those lost or
damaged– occurs in such animals as lobsters, crabs, and gecko
lizards
• B) new organisms– when an entire new organism is produced from part of
the original organism– occurs in seastars and planarians (a type of simple
annelid)
(as long as a ray--one of the points--has some of the center piece, it can grow into a whole new seastar!)
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Vegetative Propagation
• when new plants develop from roots, stems or leaves of the parent organism
• many different types: cuttings, bulbs (onions), tubers (potatoes), grafting (apples)
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***ASEXUAL REPRODUCTION IS MITOSIS!!!***
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Brainpop!
• http://www.brainpop.com/science/cellularlifeandgenetics/asexualreproduction