 Stem Cells and Cloning. Stem Cells  Stem Cell: a cell that can continuously divide and differentiate into various tissues  Two Types:  Multipotent:

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Presentation transcript:

 Stem Cells and Cloning

Stem Cells  Stem Cell: a cell that can continuously divide and differentiate into various tissues  Two Types:  Multipotent: adult stem cells and somatic cells  Pluripotent: embryonic cells and induced pluripotent stem (iPS) cells  kohn#watch kohn#watch

Cloning  Clone: an organism, cell, or piece of genetic material that is identical to the one that was preexisting; to make a genetic duplicate  Natural cloning: asexual reproduction  Abnormal development is the reason most clones do not survive very long

SCNT: Somatic Cell Nuclear Transfer  Remove nucleus of surrogate’s egg cell  Replace with nucleus of adult cell you wish to clone:  Place cell next to empty surrogate egg cell  Use an electric shock to open membranes and fuse cells  Cell will begin to divide and develop into an embryo – implant into surrogate

Cloning Humans?  Is it possible? Is it something we should be worried about? 

Ethics  Safety  Unknown effects  Results vary  Human Rights  When does human life begin?  Can iPS cells become human clones?  Genetic Engineering

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