Genetic engineering appears to offer potential health benefits but also raises many moral issues.
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98% of cloned animals have genetic deformities. Cloning humans is likely to have the same effect.
Scientists hope that stem cells can be used to help people with incurable illnesses and disabilities but we do not need to use embryos or create clones to do this; there are other sources.
PGD (pre-implantation genetic diagnosis - also known as embryo screening) refers to procedures that are performed on embryos prior to implantation tests embryos, created by IVF, for genetic disabilities or to select a tissue match to treat an older sibling with a disability.
In Britain research may be carried out on human embryos up to 14 days after conception. After 14 days they must then be destroyed.