A scientist takes a cell from one cow and an egg from a second cow. The scientist removes the DNA from the egg and replaces it with the DNA from the first cow. The scientist’s goal is to produce a baby cow with DNA that is identical to the first cow.

The scientist transfers DNA from one cow into an egg whose own DNA has been removed. This is a form of cloning: it can produce a baby cow with DNA identical to the cow that donated the DNA. Selective breeding instead involves choosing which animals reproduce; it does not directly transfer DNA into an egg.

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