Q2 of 51 Page 1

What are transgenic animals? Give an example.

A transgenic animal is any animal in whose genome any foreign, new or altered genes have been inserted using genetic engineering techniques. They are said to be genetically modified organisms. Knock-out mice are an example of transgenic organisms. Dolly the sheep is the most famous example of a transgenic animal.


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25

Give a genetic explanation for the following cross. When a tall pea plant with round seeds was crossed with a dwarf pea plant with wrinkled seeds then all the individual of F1-populations was tall with round seeds. However selfing among F1-population led to a 9: 3 3 : 1 phenotypic ratio.

 25

A. Describe the series of experiments of F.Griffith. Comment on the significance of the results obtained.

B. State the contribution of Macleod, McCarty and Avery.

 6

Name a free-living and a symbiotic bacterium that serve as bio-fertilizer. Why are they so called?

 7

Name the cells HIV (Human Immunodeficiency Virus) gains entry into after infecting the human body. Explain the events that occur in these cells.