Cloning And Dolly Sheep
Cloning And Dolly Sheep
Cloning is the production of an exact copy of an animal by means of asexual reproduction. Any two animals which contain exactly the same genes are called 'genetically identical'. An animal which is genetically identical to its parent is called a clone. A clone is an exact copy of its parent.
The cloning of animals is a special kind of asexual reproduction method. The cloning in animals is done by the transfer of 'nucleus' of a cell. This happens as follows:
Before we describe the cloning of Dolly sheep in detail, we should know the meaning of the term 'ewe'. Ewe is a female sheep. The two sheep which were involved in the cloning of Dolly sheep were Finn Dorset ewe and Scottish Blackface ewe. We can also call them female Finn Dorset sheep and female Scottish Blackface sheep. As the name suggests, the Scottish Blackface sheep has a black face. Keeping these points in mind, we will now describe the cloning of 'Dolly' sheep from Finn Dorset ewe.
Cloning of 'Dolly' Sheep:
The Dolly sheep was cloned in the following way:
Dolly was a clone of Finn Dorset sheep and produced several offsprings of her own through sexual means in due course of time. Dolly had exactly the same genetic material as her real mother Finn Dorset sheep. Dolly died on 14th February 2003 due to a lung disease.
Since Dolly, the cloned sheep. who was born in 1996, cows (and pigs) have been cloned. The cloning of superior cows which give high milk yield has become possible now. If a high milk yielding cow was to be mated with a bull for reproduction, then the resulting offspring cow may or may not be of high milk yielding breed (because of intermixing of genes of the parent bull and mother cow). On the other hand, a cow which is cloned from a parent cow of high milk yield will be an identical copy of the parent cow and hence give high milk yield.
Advantages of Cloning
The technique of cloning enables us to produce exactly identical copies of domestic animals having favourable characteristics (without the risk of losing some of the béneficial genes or introducing unwanted genes through sexual reproduction methods). Cloning produces identical copies of the parent domestic animals and helps in preserving desirable features (like high milk yield or good quality wool) of the parent animal for future generations. For example :
Which of the following are correct : (a) Dolly (the cloned sheep) was born on 5th July, 1996. (b) Dolly (the cloned sheep) was born on 5th July, 2002. (c) Dolly died on 14th February 2003 due to a lung disease. | |||
| Right Option : B | |||
| View Explanation | |||
A cow which gives high milk yield can be ______________ to produce exactly identical cows which will give high milk yield, | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) A cow which gives high milk yield can be cloned to produce exactly identical cows which will give high milk yield. (b) A cow which gives high milk yield can not be cloned to produce exactly identical cows which will give high milk yield. | |||
| Right Option : A | |||
| View Explanation | |||
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