Human Health and Disease — BIOLOGY STD 12 Science — Question

1. A garden pea plant bearing terminal, violet flowers, when crossed with another pea plant bearing axial, violet flowers produced axial, violet flowers and axial, white flowers in the ratio of 3 : 1. Work out the cross showing the genotypes of the parent pea plants and their progeny.
2. Name and state the law that can be derived from this cross and not from a monohybrid cross.

Name and describe the steps involved in the technique widely used in forensics that serves as the basis of paternity testing in case of disputes.

Describe the species according to their susceptibility to extinction and the IUCN Red List.

Describe the experiment carried out by Hershey and Chase. Write the conclusion they arrived at.

What is meant by the term bio-pesticide? Name and explain the mode of action of a popular bio-pesticide.

You are a Botanist working in the area of plant breeding. Describe the various steps that you will undertake to release a new variety.

Represent schematically the life cycle of a malarial parasite.

Bioreactors are the containment vehicles of any biotechnology-based production process. For large scale production and for economic reasons the final success of biotechnological process depends on the efficiency of the bioreactor.
Answer the following questions w.r.t. the given paragraph:
i. List the operational guidelines that must be adhered to so as to achieve optimisation of the bioreactor system. Enlist any four.
ii. Mention the phase of the growth we refer to in the statement Optimisation of growth and metabolic activity of the cells.
iii. Is the biological product formed in the bioreactor suitable for the intended use immediate? Give reason in support of your answer.

What is Mutation? Describe the main points of mutation theory?