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

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

Explain reason of sickle cell anaemia disease.

Differentiate between multiple allelism and pleiotropy with the help of an example of each.

During the secondary treatment of the primary effluent, how does the significant decrease in BOD occur?

Write the location and function of synergid.

The life of offsprings of viviparous animals are not very much at risk. Justify statement giving two reasons.###There are more probability of survival of offsprings in viviparous organisms. Explain statement with reason.

What is diapause and its significance?

Illustrate schematically the process of initiation, elongation and termination during transcription of a gene in a bacterium.

In a particular plant species, majority of the plants bear purple flowers. Very few plants bear white flowers. No intermediate colours are observed. If you are given a plant bearing purple flowers, how would you ascertain that it is a pure breed for that trait? Explain.

Discuss with your teacher and find out how to distinguish between:
Plasmid DNA and Chromosomal DNA