Abstract from: Cloning : Where Do We Draw the Line?
The first attempt in cloning was conducted in 1952 on a group of frogs.
The experiment was a partial success. The frog cells were cloned into other
living frogs however, only one in every thousand developed normally , all of
which were sterile. The rest of the frogs that survived grew to abnormally large
sizes. In 1993, scientist and director of the in vitro lab at George
Washington University, Jerry Hall and associate Robert Stillman, reported the
first ever successful cloning of human embryos. It was the discovery of in-
vitro fertilization in the 1940's that began the pursuit to ease the suffering
of infertile couples. After years of research, scientists learned that "in a
typical in-vitro procedure, doctors will insert three to five embryos in hopes
that, at most, one or two will implant" (Elmer-Dewitt 38). And that "a woman
with only one embryo has about a 10% to 20% chance of getting pregnant through
in-vitro......
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