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外研2003课标版《Writing》精品PPT课件优质课下载
04
Cloning can help to obtain a supply of stem cells to help people to recover from a disease, repair human tissue, or help them walk again after an accident.
It would be handy to clone because a prize cow can resist bacteria or disease or a cloned crop can resist rot or pest.
Cloning can reproduce the talents of exceptional human beings.
Cloning is an optional treatment for couples who find it difficult to have children.
Review:the advantages of cloning
Review:the disadvantages of cloning
02
Cloned people may possess vices instead of existing virtues.
03
The embryo would be wasted.
01
Cloned people would be under unknown psychological pressure.
04
To rely on a few cloned animals
or crops would restrict the biodiversity of the breed.
Topic of today:gene editing
2
What is gene editing?
Gene editing is the ability to manipulate – or control – DNA. And in case you didn’t know, DNA is short for deoxyribonucleic acid – this is a substance in the cells of animals and plants that contains genetic information. And a gene is part of the DNA in the cell that controls the physical development and behaviour of a plant or animal and is passed on from its parents.
Gene editing is the ability to manipulate – or control – DNA. And in case you didn’t know, DNA is short for deoxyribonucleic acid – this is a substance in the cells of animals and plants that contains genetic information. And a gene is part of the DNA in the cell that controls the physical development and behaviour of a plant or animal and is passed on from its parents.
1.manipulate
2.is short for
3.substance
4.genetic information