Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

The following is well-known abbreviation, which have been used in this chapter. Expand to its full form:

AIDS

The following is well-known abbreviation, which have been used in this chapter. Expand to its full form:

NACO

The following is well-known abbreviation, which have been used in this chapter. Expand to its full form:

HIV

A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.

1. Why in your opinion the female partner is often blamed for such situations in India? Mention any two values that you as a biology student can promote to check this social evil.
2. State any two reasons responsible for the cause of infertility.
3. Suggest a technique that can help the couple to have a child where the problem is with male partner.

What does the following equation represent? Explain:

p² + 2pq + q² = 1.

It is established that RNA is the first genetic material. Explain giving three reasons.

List the criteria a molecule that can act as genetic material must fulfill. Which one of the criteria are best fulfilled by DNA or by RNA thus making one of them a better genetic material than the other? Explain.

After a brief medical examination a healthy couple came to know that both of them are unable to produce functional gametes and should look for an ‘ART’ (Assisted Reproductive Technique). Name the ‘ART’ and the procedure involved that you can suggest to them to help them bear a child.

An infertile couple is advised to adopt test-tube baby programme. Describe two principle procedures adopted for such technologies.

Describe the various steps of Griffith’s experiment that led to the conclusion of the 'Transforming Principle'.

How did the chemical nature of the ‘Transforming Principle' get established?

Suggest some methods to assist infertile couples to have children.

State True/False with explanation.

Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/defects in the female partner.

Correct the following statement:

In E. T. techniques, embryos are always transferred into the uterus.

p² + 2pq + q² = 1. Explain this algebraic equation on the basis of Hardy Weinberg's principle.

With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?

Differentiate between a DNA and a RNA nucleotide.

What is the Founder's effect?

Explain one application of the following:
ZIFT

According to the Hardy-Weinberg principle, the allele frequency of a population remains constant. How do you interpret the change of frequency of alleles in a population?