With the help of one example, explain the phenomena of co-dominance and multiple allelism in human population.

Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-flies for his experiments? State any three reasons.

Linkage or crossing-over of genes are alternatives of each other. Justify with the help of an example.

List the symptoms of Ascariasis. How does a healthy person acquire this infection?

Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.

How does a restriction nuclease function? Explain.

How have transgenic animals proved to be beneficial in:
(a) Production of biological products
(b)Chemical safety testing.

Describe the mutual relationship between fig tree and wasp and comment on the phenomenon that operates in their relationship.

19.

Construct an age pyramid which reflects an expanding growth status of human population.

Make a list of any three out breeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.