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

• One parent• Identical to parent• More likely to get disease• Binary Fission, budding, regeneration,

spore formation

Sexual Reproduction

• Two parents – male and female• Unique offspring ( not identical to parents)• Egg, sperm• Fertilization ( egg and sperm unite)• More resistant to disease