JACOPIN / SCIENCE PHOTO LIBRARY JACOPIN / SCIENCE PHOTO LIBRARY
GENETICS, CLONING Illustration of horizontal reproductive cloning. An ovule is taken from a female donor monkey. It is fertilized in vitro with spermatozoids from a male donor monkey. After three days, the egg has divided into eight identical cells from which the nuclei, containing the genetic code of the two donors, is removed and implanted into the cytoplasm of receiving ovules from other female monkeys. These new ovules are transferred to surrogate mother monkeys who will then give birth to eight baby monkeys with genetic codes identical to that of the two original donors and who are all identical twin brothers or sisters.
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