Q8 of 40 Page 11

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.

Asexual reproduction, budding, and regeneration produces offspring with minor variations but organisms produce offspring with sexual reproduction show significant and visible variations. During sexual reproduction, the genetic information from each parent get mixed and tranfer to the offspring which leads to variety in offsprings.

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6

In a pea plant, the yellow colour of the seed dominates over the green colour. The genetic makeup of the green colour of the seed can be shown as ___________:

 7

Some people can roll their tongue and this is a genetically controlled auto-somal dominant character. [Roller = RR / Rr and Non-roller = rr]

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 ____.

 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 __________ .

 10

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 ______________: