Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

A woman with blood group O married a man with AB group. Show the possible blood groups of the progeny. List the alleles involved in this inheritance.

Define vector? write any two examples,

Legumes fertilise the soil but cereals do not. Discuss

Synthetic auxin 2, 4-D

In isolating recombinant insulin from a culture of E. coli, the cells were filtered and the filtrate was subjected to a purification protocol. However, no insulin was obtained.Why?

What are the disadvantages of conventional hybridisation in plants?

Discuss one example, based on your day-to-day observations, showing how loss of one species may lead to extinction of another.

1. List any two situations, when a medical doctor would recommend injection of preformed antibodies into the body of a patient. Name this kind of immunization and mention its advantages.
2. Name the kind of immunity attained when instead of antibodies, weakened antigens are introduced into the body.

A PCR machine can rise temperature up to 100 °C but after that it is not able to lower the temperature below 70 °C automatically. Which step of PCR will be hampered first in this faulty machine? Explain why?

Name the plant source of ganja. How does it affect the body of the abuser?