Human Health and Disease — BIOLOGY STD 12 Science — Question

β−galactosidase enzymes site is a preferred selectable marker in comparison to antibiotic-resistant selectable marker in biotechnology experiments. Justify.

What is geitonogamy? Give its one similarity to autogamy and xenogamy.

AtRNA is charged with the amino acid methionine.

1. Name the process involved in attachment.
2. Point out the mRNA codon and anticodon on tRNA for this amino acid.
3. Name the enzyme responsible for this attachment.

In peas, tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them:
Tall, Red = 138
Tall, White = 132
Dwarf, Red = 136
Dwarf, White = 128
Mention the genotypes of the two parents and of the four offspring types.

How do accessory glands in man help in semen formation and reproduction process?

During a school trip to ‘Rohtang Pass’, one of your classmate suddenly developed ‘altitude sickness’. But, she recovered after some time.

1. Mention one symptom to diagnose the sickness.
2. What caused the sickness?
3. How could she recover by herself after some time?

What is molecular homology? Cite one example.

Which three options could be thought for increasing food production?

Define co-extinction and give a example.

Mention the role of the following in E.coli cloning vector pBR 322.

1. Selectable marker.
2. ori.
3. rop.