Q10 of 40 Page 11

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 ______________:

Stem cells are biological cells that have the potency to give rise to the tissue and organs. These cells have the tendency of multiplying into numerous numbers of the same type of cell by mitosis. In mammals two types of stem cells are present—


i. Embryonic stem cells


ii. Adult stem cells

More from this chapter

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8

Hydra, a multi-cellular invertebrate of phylum Cnidaria (Coelenterata) can give rise to new offspring by various methods. Choose the method by which the offspring are produced with significant variations.

 9

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 __________ .

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In persons suffering from insulin-dependent diabetes, _____ the cells of the pancreas degenerate.

 12

Identical twins are born as a result of fertilization between_______.