Transcript Sexual / Asexual Reproduction

Sexual and Asexual Reproduction.
Asexual Reproduction:
• One parent producing an offspring
identical to itself (parent)
• Offspring can live independently
Cell Division in Unicellular
Organisms
Binary Fission:
• form of asexual reproduction in
prokaryotic (lacks nucleus) organisms
• Parent organism splits in half
(Eukaryotic – reproduce by mitosis ex:
algae, some yeast, protozoans like
paramecium)
Budding
• Organism develops tiny buds on its body
• Asexual reproduction
• Buds form from the parent cell so the bud
is identical to the parent.
• Both unicellular and multicellular
• Examples: hydra, plants, some yeast
Regeneration:
• Specialized cells grow new tissue when a
wound or lost limb occurs
• Examples: Starfish, lizard tails, planarian,
cuttings from plants….
Asexual Reproduction & Health
– Bacteria reproduces at very rapid rates
– Reason you get sick within a day..
• Spore Formation – spores = small
specialized cells that contain a nucleus
and cytoplasm surrounded by a thick
outside wall which protects the spore.
Under the right conditions the spore
can rise to a new organism. Found in
bacteria, molds, yeast, mushrooms,
mosses, ferns and some protozoans.
Sexual Reproduction
• Two parents egg (female) and sperm
(male)
• Fertilization – when egg and sperm unite
• Plants growing from seeds and animals
growing from eggs
• Creates the diversity of life on earth
• Offspring is unique
Asexual Reproduction
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One parent
Identical to parent
More likely to get disease
Binary Fission, budding, regeneration,
spore formation
Sexual Reproduction
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Two parents – male and female
Unique offspring ( not identical to parents)
Egg, sperm
Fertilization ( egg and sperm unite)
More resistant to disease