Human Reproduction — BIOLOGY STD 12 Science — Question

Why is thalassemia categorised as a Mendelian disorder? State the condition when an individual will suffer from the disease.

More than 25% of human population is suffering from hunger and malnutrition. Scientists have developed techniques where microbes are grown on industrial scale as a source of good protein which can be grown from waste water, animal manure and even sewage.
Based on the above information answer the following questions.

1. In what ways would it be helpful to humans?
2. What can be the response to such new ventures?
3. What values have been manifested in the above case?

Explain the steps involved in a polypeptide synthesis. How are the amino acids activated during polypeptide synthesis?

What is Down’s syndrome? Give its symptoms and cause. Why is it that the chances of having a child with Down’s syndrome increases if the age of the mother exceeds forty years?

Answer the following questions:
Explain Polygenic inheritance and Multiple allelism with the help of suitable examples.

Describe the structure of a young anther as seen in a transverse section.

Ramesh visited a National Park on a school trip where he saw tiger eating a deer. He got disturbed and asked his teacher why is he doing so. His teacher replied that it is natural population controlling phenomenon.

1. Which type of interspecific interaction is found between tiger and deer?
2. State the role of predators.
3. What other type of population interactions are seen in nature?
4. State the values of Ramesh towards animals.

A youth in his twenties met with an accident and succumbed to the injuries. His parents agreed to donate his organs. So, their:

1. List any two essential clinical steps to be undertaken before any organ transplant.
2. Why is the transplant rejected sometimes?
3. What views would you share with your health club members to promote organ donation?