Which statement about cloned animals is true?
A) Cloning of extinct animals has been used to resurrect the wooly mammoth.
B) Cloning has been used to preserve endangered species.
C) Cloning of the sheep "Dolly" demonstrated the efficiency of this method of reproduction,in that all embryos transferred to a surrogate mother survived to birth.
D) Cloning by transferring a nucleus from an embryo into an enucleated egg is less effective than transferring a nucleus from a mammary gland.
E) The cloned sheep named "Dolly" was a clone of the Scottish blackface sheep that gave birth to Dolly.

Question

Quizplus · Accepted Answer

Cloning has been used to preserve endangered species, such as the gaur, the African wildcat, and the banteng. While there have been discussions about cloning extinct animals, it has not yet been successfully achieved. Option C is untrue, as not all of the embryos transferred to a surrogate mother of Dolly the sheep survived to birth. Option D is incorrect, as transferring a nucleus from an embryo into an enucleated egg is more effective than transferring a nucleus from a mammary gland. Option E is also incorrect, as Dolly was not a clone of the sheep that gave birth to her, but rather a clone of a mammary gland cell from a different sheep.

Which Statement About Cloned Animals Is True