Reproductive Health — BIOLOGY STD 12 Science — Question

A non–haemophilic couple was informed by their doctor that there is possibility of a haemophilic child be born to them. Explain the basis on which the doctor conveyed this information. Give the genotypes and the phenotypes of all the possible children who could be born to them.

Study the diagram given below.

Name the linkage X, Y, Z and the respective molecules formed by them.

Define the following :
(i) Immunity (ii) Antigen (iii) Antibody (iv) Toxide (v) Immune system.

How is DNA recombinant technology helpful in detecting the presence of mutated genes in the cancer patients?

Alien species invasion has been a threat to biodiversity. Justify with the help of a suitable example. List any other three causes responsible for such a loss.

Discuss about the major programs that the Ministry of Environment and Forests, Government of India, has initiated for saving major Indian rivers from pollution.

Given below is a list of autotrophs and heterotrophs. With your knowledge about food chain, establish various linkages between the organisms on the principle of ‘eating and being eaten’. What is this inter-linkage established known as?
Algae, hydrilla, grasshopper, rat, squirrel, crow, maize plant, deer, rabbit, lizard, wolf, snake, peacock, phytoplankton, crustaceans, whale, tiger, lion, sparrow, duck, crane, cockroach, spider, toad, fish, leopard, elephant, goat, Nymphaea, Spirogyra.

What is point mutation? Give one example.

Explain innate immunity

Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?