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The first cloned sheep, 'Dolly', was produced by introducing a nucleus from an udder cell of a Finn Dorset sheep into:
AA fertilised egg of a goat
BAn enucleated ovum of a Scottish sheep
CThe udder cell of a Scottish sheep
DA red blood cell of a Finn Dorset sheep
Answer & Solution
Correct answer: B. An enucleated ovum of a Scottish sheep
1. Dolly was made by cloning, where the donor nucleus is placed in an egg whose own nucleus is removed.
2. The Finn Dorset udder cell nucleus was introduced into an enucleated ovum of a Scottish sheep, which then developed in a Scottish sheep's uterus.
3. A goat egg was not used; an intact udder cell or a non-nucleated red blood cell would not serve as the recipient egg.
4. The 'fertilised goat egg' and 'red blood cell' options trap those who forget cloning needs an enucleated ovum, not fertilisation.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 8 "Cell Biology and Biotechnology", p.104_
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