Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Write a short notes on the summits held in year 1992 and 2002.

If a marine fish is placed in a fresh water aquarium, will the fish be able to survive? Why or why not?

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 by a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny.
Tall, Red = 138
Tall, White = 132
Dwarf, Red = 136
Dwarf, White= 128
Mention the genotypes of the two parents and of the types of four off springs. in numbers mentioned against them.

In a cross between two tall pea plants, some of the offspring produced were dwarf. Show with the help of a Punnett square, how this is possible.

Or

When a tall pea plant was selfed, it produced onefourth of its progeny as dwarf. Explain with the help of a cross.

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

Arrange the following terms in the correct developmental sequence:
Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes.

Name the scientific term used for the membrane that surrounds an ovum.

How many primary follicles are left in each ovary at puberty?

The immune system of a person is suppressed. In the ELISA test, he was found positive to a pathogen.

1. Name the disease the patient is suffering from.
2. Write the full name of the causative organism.
3. Which cells of the body are affected by the pathogen.

When and where was the World Summit on sustainable development held? How many countries signed the convention? What was the objective?