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

Name the country where industrial melanism was observed in moths due to industrialization.

It is said, that the harmful alleles get eliminated from population over a period of time, yet sickle cell anaemia is persisting in human population. Why?

How do desert lizards cope with temperature variations in their environment? Explain.

Name any four autosome-linked recessive Mendelian disorders.

Carbonic anhydrase.

Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?

Explain how suspension culture is prepared from callus.

Name the process of formation of male gametes in flowering plants.

Write in brief about Ramsar convention.

1. Name the scientist who suggested that the genetic code should be made of a combination of three nucleotides.
2. Explain the basis on which he arrived at this conclusion.