Short Answer TypeWith the help of one example, explain the phenomena of co-dominance and multiple allelism in human population.
The phenomenon of multiple allelism and co-dominance is shown by the ABO blood group in human beings. The gene I for the blood group contains three alleles i.e. IA, IB and i which represents the phenomenon of multiple allelism as it has more than two alleles governing the same character. The alleles IA and IB are co-dominant and express themselves even in the presence of the other. Thus the presence of both the alleles IA and IB gives the blood group of AB.
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.
Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.
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.
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.
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