Human Reproduction — BIOLOGY STD 12 Science — Question

List six advantages of ex-situ approach to conservation of biodiversity.

What are the Assisted Reproductive Techniques practised to help infertile couples? Describe any three techniques.

Study the pedigree chart given above, showing the inheritance pattern of blood groups in a family and answer the following questions:

1. Give the possible genotypes of the individuals 1 and 2.
2. Which antigen or antigens will be present on the plasma membranes of the RBCs of individuals 5 and 9?
3. Give the genotypes of the individuals 3 and 4.

The cytological observations made in a number of insects led to the development of the concept of genetic/ chromosomal basis of sex-determination mechanism. Honey bee is an interesting example to study the mechanism of sex-determination. Study the schematic cross between the male and the female honey bees given below and answer the questions that follow:

1. Identify the cell divisions ‘A’ and ‘B’ that lead to gamete formation in female and male honey bees respectively.
2. Name the process ‘C’ that leads to the development of male honey bee (drone).

Write a short note on Apomixis and polyembryony.

What is necessary to maintain good health? Write any four benefits of good health.

Define Cancer. Write any five of its main symptoms.

Now, sequencing of total genomes getting is getting less expensive day by the day. Soon it may be affordable for a common man to get his genome sequenced. What in your opinion could be the advantage and disadvantage of this development?

Expand the following and explain any one of them:

1. IVF
2. ZIFT
3. MTP

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 the male partner.