Reproductive Health — BIOLOGY STD 12 Science — Question

Tell about other methods of introducing foreign DNA into host cells.

How do surgical procedures prevent conception in humans? Explain the way it is achieved in human males.

The male fruit fly and female fowl are heterogametic while the female fruit fly and the male fowl are homogametic. Why are they called so?

DNA is unzipped twice in a cell. Mention the two events and the enzymes responsible for it.

Describe how biotechnology has helped in producing more nutritionally balanced milk. Write the full forms of the following:

1. GEAC
2. PKU

Classify the following contraceptive measures into different methods of birth control.

1. Saheli.
2. Tubectomy.
3. Vasectomy.
4. Condoms.
5. Diaphragms.
6. Cervical caps.

If the chromosome numbers in meiocytes of human beings, rat, elephant, rice, butterfly and onion are 46, 42, 56, 24, 380 and 32, respectively.
What will be the chromosome numbers in gametes of these species?

Why is tobacco smoking associated with rise in blood pressure and emphysema (Oxygen deficiency in the body)? Explain.

What is IUCN red list? Give any two uses of this list.

Explain the difference between homologous and analogous organs with examples.