Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Classify the chromosomes on the basis of position of centromere.

Heat loss or heat gain depends upon the surface area of the organism's body. Explain with the help of a suitable example.
OR
Explain, why are small animals rarely found in the polar regions?

At the time of Independence, the population of India was 350 million, which exploded to over 1 billion by May 2000. List any two reasons for this rise in population and any two steps taken by the government to check this population explosion.

Explain different biosafety issues which may arise due to genetically modified (GM) organisms.

Name the respective asexual reproductive structures of Yeast and Sponge.

Is haemophilia in humans a sex-linked or an autosomal disorder? Workout a cross in support of your answer?

Gene flow occurs through generations. Gene flow can occur across language barriers in humans. If we have a technique of measuring specific allele frequencies in different population of the world, can we not predict human migratory patterns in pre-history and history? Do you agree or disagree? Provide explanation to your answer.

In snapdragon (Antirrhinum majus), a cross between varieties with red and white flowers produces an all pink progeny.
Explain how it is a case of incomplete dominance and not of blending inheritance.

Give reasons : Innate immunity is also known as non-specific immunity.

How are auto-immune diseases different from immunodeficiency disease? Give one example of each in human.