Altering the DNA of humans - should we allow gene editing?

Should scientists be allowed to do research which alters the DNA of human embryos?

It is a question being discussed by hundreds of scientists from 20 countries in Washington, at a conference on what is known as gene editing.

The technology makes it possible to change the genes parents pass on to their children.

It might help prevent inherited diseases - but it also gives rise to fears about creating designer human beings.

Fergus Walsh reports.