Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Explain giving one example, how co-extinction is one of the cause of biodiversity loss? List the other three causes also.

It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.

1. Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.
2. By taking one example of a local plant and animal, how would you help these parents to overcome such inhibitions about reproduction and sexuality?

Explain three main functions of free antibodies produced by B-lymphocytes.

Explain the following two components of Darwin's theory of natural selection.

1. Variations.
2. Formation of new species.

Name the two forms of reservoir of carbon that regulate the ecosystem carbon cycle.

1. What do ‘Y and ‘B’ stand for in ‘YAC’ and ‘BAC’ used in Human Genome Project (HGP)? Mention their role in the project.
2. Write the percentage of the total human genome that codes for proteins and the percentage of discovered genes whose functions are known as observed during HGP.
3. Expand ‘SNPs’ identified by scientists in HGP.

State the function of a reservoir in a nutrient cycle. Explain the simplified model of carbon cycle in nature.

Explain about the factors that affect water absorption.

Define Biotechnology? How it is used in production of Human insulin.