What is reproduction?Reproduction is the process by which organisms produce more of their own kind.

Think about it – Without reproduction, all

life on earth would no longer exist.

What is Asexual Reproduction?Only one parent is involved.Offspring are genetically identical to their

parents.All cells that come from a single cell are

genetically identical to it and to each other; they are all clones.

The new cells are produced by mitosis

Types of Asexual Reproduction

Mitosis - is the exactduplication of the

nucleusof a cell so as to form

twoidentical nuclei during

celldivision.

Types of Asexual Reproduction

Binary Fission - occurs in one-celled organisms such as the ameba and bacteria. The nucleus divides by mitosis and the cytoplasm divides, forming 2 new daughter cells of equal size.

http://wappingersschools.org/RCK/staff/teacherhp/johnson/visualvocab/BinaryFissionParamecium.jpg

http://coris.noaa.gov/glossary/binary_fission_186.jpg

BuddingProcess by which a new, duplicate plant or

animal begins to form at the side of the parent and enlarges until an individual is created.

Very common in plants;Budding results from an equal division of

Genetic information, but an unequal division of cytoplasm or body tissues

Types of Asexual Reproduction

Budding - Occurs in Hydra and yeast. The division of cytoplasm is unequal so one of the daughter cells is larger than the other. The daughter cells can separate or remain attached.

http://www.waycross.edu/faculty/bmajdi/hydra%20budding.jpg

Hydra

http://judyepstein.com/images/DesertImages/Budding-Purple-LG.jpg

Types of Asexual ReproductionSporulation - occurs in

molds, mosses, etcSpores are produced

in large numbers by mitosis.

Spores are surrounded by a tough coat to help them survive harsh environmental conditions.

Spores usually travel to a new location where they grow into an adult organism

Types of Asexual Reproduction

Regeneration - Refers to the replacement or regrowth of lost or damaged body parts

Organisms with undifferentiated tissues are more likely to utilize regeneration

http://classes.design.ucla.edu/Spring05/152BC/projects/saito/ex3/planaria.jpg

Planaria

http://www.vsf.cape.com/~jdale/science/starfishregenerating.jpg

Starfish

GraftingGrafting is a process by which two different plants are united so that they grow as one.

Used to make seedless varieties, multiple fruit types per tree…

Cloninga method of producing genetically

identical organisms.been done with plants for centuries.

examples : cuttings, tubers, bulbs, runners.

in animals and humans it’s more complicated.

cloning raises ethical and moral issues.

Animal CloningHow its done:

a) obtain an egg cell from the female of the species to be cloned.

b) remove the nucleus from the egg cell. c) obtain a body cell from the species to be cloned.d) remove the nucleus from this cell.e) place the nucleus from the body cell into the

egg cell. f) place this cell into the uterus of the female of

the species to clone.g) after the normal gestation period, the clone will

be born.

Cloning Animals

Problems with CloningCloning has a low success rateCloned organisms often have a shortened

life spanCloning is incredibly expensive