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are long bits of DNA
which code the instructions to build bodies in certain
ways. Scientists know a lot about how genes work. They
know how to 'snip' genes out of one place and 'stick'
them into another. This is the hi-tech world of genetic
engineering. We'll look at this in a moment. But first,
let's ask a question or two. Why do it? What's the point
of tinkering with genes - genetic engineering?
is called breeding. And believe it or not, all dogs from huge St Bernards
to tiny Chihuahuas have been selectively bred by humans from one type
of wild dog - probably a wolf. A
St Bernard and a Chihuahua are the same species
even though a St Bernard could gobble up a Chihuahua in one gulp. Being
the same species means you can breed with any other member of your species.
So you, a human, can breed - or mate - with any other human of the opposite
sex to make a baby.