| Year |
Description |
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| 1952 |
The first cloned animal was a tiny tadpole. Robert briggs and Thomas King used cells from a tadpole embryo to create identical ones. |
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| 1972 |
| Scientists isolated and binded a gene to a yeast, which incorporated the gene into its own DNA and reproducesd it. |
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| 1976 |
Rudolf Jaenisch injected human DNA into mouse eggs to produce mice that contain and pass down human genetic material to their offspring. |
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| 1978 |
Baby Louise was the first human to be conceived through in-vitro fertilization. British doctors fertilized the egg in a petridish with a sperm, then implanted the embryo in the uterus of a woman. |
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| 1987 |
Sheep and cows were the first mammals to be cloned from embryonic cells. Since the embryos are sexually fertilized, they contain the genetic material of both parents. |
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| 1997 |
The first mammal cloned from a cell of an adult animal was Dolly the sheep. Although she was born in 1996, she was only made known to the world in February of 1997. Ian Wilmut and his colleagues at the Roslin Institute in Scotland cloned Dolly from the cell taken from the udder of an ewe. |
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| 1998 |
| Three generations of mice are created from clones made at the Unversity of Hawaii. At the same time, Japanese researchers successfully cloned calves from the biopsied cells of an adult cow. |
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| 2000 |
Tetra was the first monkey to be cloned. Oregon researchers created Tetra by splitting an eight-celled embryo into four pieces, which were then nurtured into new embryos. |
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| 2001 |
Britain was the first country to allow the cloning of human embryos to be legal. The government allowed rsearch on stem cells found in embryos, and the clones created would be required to be destroyed in 14 days. However, the creation of babies by cloning was still outlawed. |
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| 2002 |
Texas A&M researchers created "CopyCat", the first cloned domestic cat. "CopyCat" was a twin of her mother. |
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| 2003 |
Italian scientists created the first cloned horse, Prometea. Prometea was created from a cell of the horse who gave birth to her. |
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| 2004 |
U.S. and South Korean researchers cloned a human embryo, generating the first published report of cloned human stem cells. |