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Asexual reproduction

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  • 1. AsexualReproduction
  • 2. Reproduction• Reproduction is the capacity of all living things to give rise to new living things.• includes the transmission of hereditary material from the parent/parents.• two types – asexual beginning – sexual.
  • 3. Asexual Reproduction Basics Is the simplest form of reproduction Occurs in plants, simple animals, bacteria, and protists Requires one parent Is more reliable than sexual reproduction Doesn’t allow for any type of genetic variation
  • 4. The 6 typesSporulationFragmentationRegenerationBinary FissionBuddingVegetative propagation
  • 5. SporulationUses spores spore is a reproductive cell that produces a new organismSpores are unicellularIf conditions are right a spore will develop into a new individualThey can be carried by the wind, water, or animals
  • 6. FragmentationWhen a organism is broken into morethan one partOrganism must have good regenerationabilitiesCreate many new organisms quickly
  • 7. RegenerationAn organism can replace/re-grow aninjured or lost partRegeneration in plants from Roots Stem leafRegeneration in animals For simple organisms No vertebrates have this power Examples are starfish and the salamander
  • 8. Binary FissionOne parent dividing into two bymitosisOffspring are always geneticallyidenticalCells may stay close together toform filaments or coloniesExamples-Bacteria and Amoebas
  • 9. BuddingForm on part of the parent bygrowing an outgrowth which thendetachesExample- is Hydra and YeastOffspring will always be geneticallyidentical to the parent
  • 10. Vegetative Propagation Plant parts make new plant Reproduction is very quick Disadvantage: many plants grow close to each other1. Bulbs – Underground stem – Surrounded by colorless leaves – Colorless leaves protect the bulb – The green leaves store the food
  • 11. 2. Rhizomes – Underground stem – They store food for new plant – At the end of Rhizomes nodes form3. Runners/Stolon (strawberries) – They are above ground. – Stems – Nodes form at the end of Runners – They grow outward
  • 12. 4. Tuber (potatoes) – Underground stem – Stores food – The nodes eat the tuber – Potatoes have eyes / buds to make new tubers and or reproduce5. Grafting – Surgically connecting two similar plants – Ex. Apples – Not done naturally
  • 13. 6. Cutting – Cutting off a stem or leaf to reproduce a new plant – Must be in wet or moist area – Combination of regeneration and fragmentation – Not done naturally7. Stolon -