types of reproduction asexual sexual. heredity table of contents 7.4.1 notes asexual reproduction...
TRANSCRIPT
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Types of Reproduction
Asexual
Sexual
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Heredity Table of Contents
• 7.4.1 Notes
• Asexual Reproduction Tree Map
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• SPI 7.4.1—Classify methods of reproduction as sexual or asexual
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Purpose of Reproduction
• To make sure a species can continue.– Definition: Reproduction is the process by
which an organism produces others of its same kind.
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Asexual Reproduction
• A new organism (sometimes more than one) is produced from one organism.
• The offspring will have hereditary material uniform with the hereditary material of the parent organism. (The offspring will be genetically the same as the parent)
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Types of Asexual Reproduction
• Budding
• Regeneration or Fragmentation
• Fission (Binary fission)
• Spores
• Vegetative Propagation
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Budding
• Process by which a new, duplicate plant or animal begins to form at the side of the parent and enlarges until an individual is created.
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http://www.waycross.edu/faculty/bmajdi/hydra%20budding.jpg
Hydra
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http://judyepstein.com/images/DesertImages/Budding-Purple-LG.jpg
Cacti
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Regeneration or Fragmentation
• The ability to restore lost or damaged tissues, organs or limbs.
• It is a common feature in invertebrates, like worms and starfish.
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http://www.vsf.cape.com/~jdale/science/starfishregenerating.jpg
Starfish
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http://classes.design.ucla.edu/Spring05/152BC/projects/saito/ex3/planaria.jpg
Planarians
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Fission
• Also called binary fission.
• Becoming two by division of the complete organism.
• A type of cell division.
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http://wappingersschools.org/RCK/staff/teacherhp/johnson/visualvocab/BinaryFissionParamecium.jpg
Paramecium
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http://coris.noaa.gov/glossary/binary_fission_186.jpg
Bacteria
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Spores
• A reproductive cell capable of developing into a new individual without fusion with another reproductive cell
• Found in mold, fungi, and ferns
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Mold
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Puffball
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Ferns
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Vegetative Propagation
• A process which doesn’t involve a seed to produce new plants.
• Examples: runners, bulbs, cuttings, grafting
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Bulbs
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Cuttings
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Grafting
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Runners
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Sexual Reproduction
• Requires two sex cells – egg and sperm
• The egg and sperm join to form an entirely new organism– Different from the parent organism
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Flowering plants
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Seeds
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Eggs
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Fish eggs
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Frog eggs
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Baby hedgehogs
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Baby animals
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Human babies
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IMPORTANT!
• Asexual reproduction results in offspring that are genetically identical to the parent organism
• Sexual reproduction results in offspring that are genetically different from the parent organisms
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Sexual versus Asexual Reproduction
Type of Reproduction Advantages Disadvantages
Sexual
Diversity in offspring
Offspring less likely to have mutations show up
Requires a mate to reproduce
Population increases are limited
Asexual
Can increase populations rapidly
Does not require a mate for reproduction to take place
Lack of diversity in offspring
Because they reproduce offspring genetically identical to parents, the offspring inherit any mutations of the parent.
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Exit Slip
• Describe the difference between asexual and sexual reproduction.