Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

A number of passengers were severely burnt beyond recognition during a train accident. Name and describe a modern technique that can help hand over the dead to their relatives.

OR

Following the collision of two trains a large number of passengers are killed. A majority of them are beyond recognition. Authorities want to hand over the dead to their relatives. Name a modern scientific method and write the procedure that would help in the identification of kinship.

Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement.

In pea plants, the colour of the flower is either violet or white, whereas human skin colour shows many gradations. Explain giving reasons, how it is possible.

Define the terms and give one example for each: Parasitism

Unambiguous, universal and degenerate are some of the terms used for the genetic code. Explain the salient features of each one of them.

During his studies on genes in Drosophila that were sex-linked. T.H. Morgan found population phenotypic ratios deviated from expected 9 : 3 : 3 : 1. Explain the conclusion he arrived at.

List the four important changes, taking place during biotic succession.

Name and explain the techniques used in the separation and isolation of DNA fragments to be used in recombinant DNA technology.

How are dominance, co–dominance and incomplete dominance patterns of inheritance different from each other?

What type of organs eye of an Octopus and that of a human called? Give another example from the animal group and one from the plants of such organs. Name and explain the evolutionary process they exhibit.