In 1997, Dolly the Sheep Was Cloned

question 22

Multiple Choice

In 1997, Dolly the sheep was cloned. Which of the following processes was used?

• A) use of mitochondrial DNA from adult female cells of another ewe
• B) replication and dedifferentiation of adult stem cells from sheep bone marrow
• C) separation of an early-stage sheep blastula into separate cells, one of which was incubated in a surrogate ewe
• D) fusion of an adult cell's nucleus with an enucleated sheep egg, followed by incubation in a surrogate

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