Evolution — BIOLOGY STD 12 Science — Question

How is recombinant DNA technology helping in detecting the presence of mutant genes in cancer patients?

What is health? What is important to maintain good health?

Write the scientific name of the fruit–fly. Why did Morgan prefer to work with fruit–flies for his experiments? State any three reasons.

Name indicating their functions, a few additional enzymes, other than DNA polymerase and ligase, that are involved in the replication of DNA with high degree of processivity and accuracy.

Is the use of contraceptives justified? Give reasons.

List the specific symptoms of typhoid. Name it's causative agent.

How does addition of a small amount of curd to fresh milk help in the formation of curd? Mention a nutritional quality that gets added to the curd.
OR
How does ‘starter’ added to milk help it to set into curd?

Selection process after hybridisation is very crucial in breeding programmes. Give reason.

How to Prevent STIs ?###What are the measures one has to take to prevent from contracting STDs?

'Introducing sex education in school is a good step for providing right information to adolescents'. In context to the statement given above, answer the questions that follow.

1. Which part of the brain controls the sex urge?
2. What are the necessary topics that should be taught in schools, in context of STDs and AIDS.