Many people have breathing problems because they are allergic to cats. The allergy is caused by a chemical called Fel D1. Different cats produce different amounts of Fel D1. A cat has been bred so that it does not produce Fel D1. The cat does not cause an allergic reaction. Explain how the cat has been produced using selective breeding. – 7078

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1. Process (Selective Breeding):
   Choose cats that make less Fel D1.Breed these cats together.From their kittens, choose those with the lowest Fel D1 again.Repeat this over many generations.Why it works:Some kittens will naturally produce less Fel D1.
   By always picking and breeding the ones with the least Fel D1, the overall cat population will gradually produce less of it.
   Breeding is done carefully to keep cats healthy and avoid problems.

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