Cons on Cloning Animals

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Financial Costs

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  Cloning is expensive and inefficient. Fewer than 10 percent of cloning attempts successfully produce viable offspring.

Medical Problems

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  Cloned animals often suffer from compromised immune systems and have higher rates of infections and cancer.

Premature Death

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  Many cloned animals have died prematurely, often with no visible ailment.

Compromised Genes

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  A 2002 study at the Whitehead Institute for Biomedical Research in Cambridge, Mass., found that the genomes of cloned mice are often compromised. Their research indicated that 4 percent of genes in cloned mice function abnormally.

Pet Cloning

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  Cloning often appeals to pet owners who wish to create a pet identical to the one they lost. The Humane Society of the United States discourages pet cloning, however, noting that cloning cannot exactly recreate an animal, and many animals in shelters are desperate for homes.