Molecular Basis of Inheritance — 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.

How are viroids different from viruses?

The following is the flowchart highlighting the steps in DNA fingerprinting technique. Identify A, B, C, D, E and F.

Which part in the male reproductive system stores sperms?

Write a short note on female accessory ducts.

Name the type of human cell HIV attacks on its entry into the body. Explain the events that occur in the cell which further lead to cause immunodeficiency syndrome.

Explain what is the difference between the theory of De Vries and Lamarck

Rohan saw Mr. Sharma collecting different plant specimens. He was confused to see him doing this collection and approached him asking about it.
Mr. Sharma told him that he will cross different plant specimens in his laboratory for obtaining better varieties of plants.

1. Why is he interested in such experiments?
2. Name this technique.
3. What precautions he should take while applying this technique?
4. What values are shown by Rohan?

Is an aquarium a complete ecosystem?