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Breakthroughs in IVF could ‘threaten our humanity’ by prompting parents to demand designer babies, Robert Winston has warned.

The fertility pioneer said that he feared a time when the rich could alter the appearance and ability of children by tinkering with their genes.

And he claimed a ‘toxic’ climate had been created by the desperation of childless couples and the pace of scientific developments in the booming IVF industry.

Warning of a resurgence in eugenics, the broadcaster and Labour peer said there was a ‘real risk that we could see that kind of attitude in our humanity occurring again’.

In the future, he claimed, the rich may be able to pay to have babies with enhanced intelligence, musical ability and strength.

Lord Winston’s comments will be hugely controversial among fertility experts, not least because he is a pioneer in IVF treatment and has helped to bring more than 10,000 babies into the world.

Medical ethicists last night praised him for speaking out, saying it was refreshing to hear a scientist who ‘saw the bigger picture’ about the potential dangers. But...