a 7-month-old sheep named
Dolly became a celebrity. Dr. Ian
Wilmut, a Scottish scientist, announced to the world that
he had created her using a procedure called cloning. Cloning
is a method that scientists use to produce a genetic copy
of another individual. In other words, Dolly is a
clone of her mother.
Dolly had three mothers. One mother gave Dolly her DNA, one
mother supplied an egg, and the third mother, her surrogate
mother, gave birth to her.
an animal gets half of its
DNA from its mother and half from
its father. Dolly is an identical twin of the mother who gave
her her DNA. But Dolly is six years younger.