Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

A true breeding tall plant is crossed with a true breeding dwarf plant. F, progeny is 100% tall and F, has tall : dwarf in the ratio 3 : 1.

1. Explain why F, shows only one type of parental phenotype.
2. Name the patterns of inheritance in which the ratio deviates from above. Also mention the deviated phenotypic ratio.

Fed up of a large family, a couple wanted to adopt a terminal method of contraception. Describe the process conducted by the doctor in either of the cases (male/female partner).

A3' ............ 5'B
C5’ ........... 3'D.
AB and CD represent two strands of a DNA molecule. When this molecule undergoes replication, forming a replication fork between A and C in the above.

1. Name the templete strand for replication.
2. Using which strand as the templete, will there be continuous synthesis of a complementary DNA strand
3. Complementary to which strand will okazaki segments get synthesised, discontinuous synthesis occurs.
4. What are templete strands and Okazaki pieces?
5. In which direction is a new strand synthesised?

Explain outbreeding devices in angiospermic plants.

Wings of birds and wings of butterflies contribute to locomotion. Explain the type of evolution such organs are a result of.

What is gene therapy? Illustrate using the example of adenosine deaminase (ADA) deficiency.

During translation, complementarity principle is not applicable.

Differentiate between predators and parasites.

Observe the given figure and answer the questions:1. Which trophic level has maximum energy?
2. Why carnivores have least energy shown in this diagram?

Study the flow chart given below:

1. Identify the events that take place at stages.

1. And.
2. respectively.