Human Health and Disease — BIOLOGY STD 12 Science — Question

State the Mendelian principle which can be derived from such a cross and not from monohybrid cross.

Prashant's mother is suffering from a disorder for which doctor suggests her to take insulin injections. But his mother declines as she presumes injections are prepared by slaughtering of animals. Doctor smiled and explained him about the genetically engineered human insulin produced these days. He also convinced her to take injections.

1. Name the bacterium that is used to produce human insulin.
2. Name the company that first produced human insulin.
3. Name the disease that is treated by using human insulin.
4. What values are shown by the doctor?

Can a child have blood group O if his parents have blood group ‘A’ and ‘B’. Explain.

How can you, as an individual, prevent the loss of biodiversity?

What is cancer? How is a cancer cell different from normal cell? How do normal cells attain cancerous nature?

Explain the stages in sexual reproduction of an organism. Mention what major events occur in each of them.

1. With labelled diagrams, depict stages in embryo development in a dicotyledonous plant.
2. Endosperm development precedes embryo development. Why?

1. Why is haemophilia generally observed in human males? Explain the conditions under which a human female can be haemophilic.
2. A pregnant human female was advised to undergo M.T.P. It was diagnosed by her doctor that the foetus she is carrying has developed from a zygote formed by an XX-egg fertilised by Y-carrying sperm. Why was she advised to undergo M.T.P.?

Briefly describe various steps involved in plant breeding.