Which of the following is true of the cloning experiment that resulted in Dolly the sheep?
A) Dolly was genetically identical to the egg-cell donor.
B) Dolly was cloned by fusing an egg with an embryonic stem cell.
C) Dolly was infertile, which indicated incomplete nuclear reprogramming.
D) Dolly was cloned by using a differentiated cell fused to an egg from another breed of sheep.
E) Dolly was cloned by fusing the nuclei from two separate eggs harvested from the same individual.
Answer: D
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