Human Health and Disease — BIOLOGY STD 12 Science — Question

Name two STDs which can be transmitted through contaminated blood.

OR

Name two sexually transmitted diseases that do not specifically affect the reproductive organs.

A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters. Name the type of cross.

Name the enzyme and state its property that is responsible for and discontinuous replication of the two strands of a DNA molecule.

Which is smallest RNA and how many nucleotide has it?

What do you mean by fermenter?

Before integrating DNA with bacterial plasmid, bacterial cells are treated with calcium. Why?

Morgan et al found that even on the same chromosome, recombination between some gene pairs was higher than that between some other gene pairs. Give reason for this observation.

Write the name of contraceptive pills taken once in a week.

Mention the combination(s) of sex chromosomes in a male and a female bird.

What are those organisms called whose genes have been modified by manipulation?