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57329
Cloning
Descrição
Biology Mapa Mental sobre Cloning, criado por Bethan Clark em 25-04-2013.
Sem etiquetas
biology
biology
Mapa Mental por
Bethan Clark
, atualizado more than 1 year ago
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Criado por
Bethan Clark
mais de 11 anos atrás
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Resumo de Recurso
Cloning
Tissue Culture
1) Parent plant with desired characteristics is selected
2) A few cells are scraped off into several beakers containing nutrients and hormones
3) A week or two later there are lots of genetically identical plants growing
The process must be aseptic (carried out in the absence of harmful bacteria) otherwise the plants will rot
Embryo Transplants
1) Parents with desired characteristics are mated
2) Embryo is removed before the cells become specialised
3) Then they are split into several clumps
4) These embryos are implanted into the uterus of sheep who will give birth to the clones
The offspring are genetically identical to each other but not to the parents
Adult cell cloning
1) An egg is taken from an ovary of sheep A
2) A cell is taken from the udder of sheep B
3) The egg is enucleated (no nucleus)
4) The udder cell and the enucleated egg are fused with electricity
5) Now an egg has been made that contains DNA from sheep B
6) Cell division happens until an embryo is formed
7) The embryo is implanted into the uterus of sheep A
8)A sheep is born with the DNA from sheep B (a clone of sheep B)
Genetic Engineering
1) An enzyme is used to cut a chromosome so DNA can be removed
2) Another enzyme is used to cut open a bacterial DNA (plasmid)
3) Enzymes are used to insert the piece of human DNA into the plasmid
4) The plasmid is reinserted into a bacterium which divides rapidly
Benefits: plants and animals can be modified to have desired characteristics
Disadvantages: costly and a single mistake could create a new genetic disorder, for example.
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