cloning
the production of genetically identical cells, tissues and organisms
Therapeutic cloning: using stem cells for treatment of disease i.e.. for healing
USES: e.g. using stem cells to cultivate
healthy cells to replace damaged
cells in degenerative disease
e.g. Parkinson's, spinal injuries or
growing organs from single cells
ADV: reduce risk of rejection, reduce need
for organ donation
REPRODUCTIVE CLONING: ooo
oooo
ooo ooo implanted in uterus of
oooo
1. Splitting embryos: oooo
ooo surrogate ‘cows’
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oooo
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Uses: to clone livestock with desired traits - disease resistant, milk production.
2. Nuclear transfer: (e.g. dolly the sheep)
1) ‘champion sheep’ - extract a (2n) somatic cell
—> remove nucleus (with the good genes)
2) ‘surrogate sheep’ - take her egg cell
—-> remove nucleus and discard
3) take the 2n nucleus and place it into the empty egg cell case
ooo
4) this ‘zygote’ undergoes mitosis to form an embryo oooo
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5) several embryos are implanted into surrogate mother
6) clones are born with the ‘good genes’ from the original ‘champion’ sheep
SOMATIC CELL NUCLEAR TRANSFER
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