Organisms and Populations — BIOLOGY STD 12 Science — Question

Who proposed the operon concept?

Explain the steps involved in the production of genetically engineered insulin.

Name the category of disease in which ‘Rheumatoid arthritis' in human, put under.

OR

Name the category of the disease, rheumatoid arthritis.

In a test cross progeny of pea plants, all were bearing violet flowers. Give the genotypes of the parent pea plants.

Which one out of an intron and an exon is the reminiscent of antiquity?

Malaria, typhoid, pneumonia and amoebiasis are some of the human infectious diseases. Which ones of these are transmitted through mechanical carriers?

In which organ occurs storage and maturation of sperms?

When a tall pea plant was self-pollinated, one-fourth of the progeny were dwarf. Give the genotype of the parent and the dwarf progenies.

How is ‘stratification’ represented in a forest ecosystem?

A change in the amino acid at the sixth position in the beta globin chain leads to sickle-cell anaemia. Name the amino acid that has changed and the new amino acid.