Question

Cloning is the production of an exact copy of a cell or any other living part of a complete organism. A sheep named Dolly was the first mammal to be cloned by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh.

Find out the incorrect statements about the cloning of Dolly.

(i) Dolly was born on 5th July 1996.
(ii) Dolly was given birth by the Finn Dorsett sheep.
(iii) Dolly was found to be absolutely identical to the Scottish blackface.
(iv) The nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed.

• A. (i) only
• B. (ii) and (iii)
• C. (i), (ii) and (iii)
• D. All of the above

Answer 1

The correct option is B (ii) and (iii)

Dolly was born on July 5, 1996, at Roslin Institute, the first mammal known to be cloned. A cell taken from the mammary gland of a 6-year-old Finn Dorset ewe was cloned through a technique known as nuclear transfer. The reproductive egg cell was removed from another female sheep, a ewe of a Scottish Blackface. The nucleus of the Scottish Blackface egg cell was then replaced with the nucleus from the Finn Dorset mammary cell. This egg was then transferred to the uterus of the surrogate mother. Thus, statements (ii) and (iii) are incorrect.

So, the correct answer is 'B'.