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    How does embryo screening work? And what are the pros/cons?

    You don't actually need to know how it works for GCSE, just that it is used to scan for different inherited diseases e.g. polydactyly and cystic fibrosis.

    The arguments for it are that it allows the parents a choice on whether to go through with the pregnancy, knowing that their child will have a genetic disorder.
    They also have the choice to try again for another child.

    However, the process is expensive which for diseases such as polydactyly, which are not actually harming the child, may be considered a waste of money.
    Also, embryos may be discarded which raises ethical issues.

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