Q9 of 40 Page 11

The following are the events in the formation of the first cloned animal – the sheep Dolly.

a) Removal of haploid nucleus from the ovum.


b) Implantation of ovum with diploid nucleus into the surrogate mother.


c) Collection of udder cell from the sheep.


d) Injection of diploid nucleus of udder cell into the enucleated ovum.


e) Development of a young clone.


The correct sequential order of these events is __________ .

The sheep Dolly was the first cloned mammal from an adult somatic cell. Dolly was developed by Dr.Ian Wilmut and his colleagues in Roselind Institute in Scotland in July 1996. There was no gentic modification carried out on donor nucleus. The scientists used the nucleus of udder cell which contains, diploid number(2n) of chromosomes. She was created by the technique of somatic cell nuclear transfer.

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A child who can roll the tongue has one brother who is a non-roller and two sisters who are rollers. If both the parents are rollers, the genotypes of their parents would be ____.

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The following are statements about stem cells:

a) There are unspecialised / undifferentiated cells.


b) They can be transformed into any type of body cell.


c) They can multiply rapidly to form a large number of similar types of cells.


d) They cannot transform into cardiac cells or nerve cells.


e) They are obtained from reproductive progeny only.


The correct statements are ______________:

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