Uses Of Mitosis In Asexual Reproduction

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Uses Of Mitosis In Asexual Reproduction

• Prepared By Ms A. Veira
• Form 5 Genetics

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BINARY FISSION

• Unicellular organisms
• Organism divides into two parts each of which is
  a new organism
• Order chromosomes replicate, nucleus divides,
  cytoplasm divides.

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Binary Fission
http//upload.wikimedia.org/wikipedia/commons/thum
b/e/e0/Major_events_in_mitosis.svg/300px-Major_eve
nts_in_mitosis.svg.png
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2. VEGETATIVE PROPAGATION

• Asexual reproduction in plants
• Egs avocado, citrus, cannabis, sugarcane, grapes,
  pineapple, strawberry, vanilla, tea etc..
• Natural and artificial means
• Natural Bulbs, corms, rhizomes, tubers, tap
  roots, runners, stolons, tillers.
• Artificial layering, budding, cuttings and
  graftings

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Runners

• Runner strawberry
• Stems grow from parent, runner touches ground,
  adventitious roots form.

http//image.tutorvista.com/content/reproduction/v
egetative-propagation-by-runners.jpeg
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RUNNERS CONTD
http//image.tutorvista.com/content/angiosperm-mor
phology/stolon-in-strawberry-and-colocasia.jpeg
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Bryophyllum-a natural example of vegetative
propagation
portstephens.local-e.nsw.gov.au/.../1343.html
http//www.bryophyllum.com/bimg-daigremontianum-cl
oseup.jpg
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Stolons

• A runner formed underground
• Common in grasses, eg nutgrass.

http//www.directpestcontrol.com.au/i/1/userimages
/Image/image039.jpg
www.wynnslawncare.com/page.asp?pageweeds
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Tillers

• A stem produced at the base of plants especially
  grasses.
• Stem shoots up from soil. Eg. Bamboo

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Artificial Propagation Cuttings

• Stem cut near node and pushed into soil
• New roots grow from stem.
• Egs. Sugarcane,African violet, chrysanthemum,
  Geranium

http//www.wildchicken.com/nature/garden/cut_back.
jpg
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Artificial Propagation Grafting

• Cutting called SCION is inserted into a slit in
  the stem of another plant (STOCK) and the joint
  is bound and sealed.
• Egs.apples, pears, tomatoes, mangoes etc

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Grafting Contd
http//www.thefilipinoentrepreneur.com/images/mang
o_bark_grafting_07.jpg
http//asgap.org.au/APOL7/qu-graft.gif
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Tissue Culture
http//omagrotech.com/Images/tissueCulture.jpg
www.jyi.org/.../issue1/features/parsley.html
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Cloning Of Animals
http//gaaraujo.files.wordpress.com/2008/04/dollyd
iagram.gif
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Cloning Contd
http//www.millerandlevine.com/cloning/dolly-fig-1
3-13.jpg
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Review Cloning/Identical Twins

• Zygote separates into two.
• HOME WORK What are some advantages and
  disadvantages of tissue culture and animal
  cloning.