Human Reproduction — BIOLOGY STD 12 Science — Question

Mention a product of human welfare obtained with the help of each one of the following microbes:

1. LAB.
2. Saccharomyces cerevisiae.
3. Propionibacterium shermanii.
4. Aspergillus niger.

The evolutionary story of moths in England during industrialisation reveals, that 'evolution is apparently reversible'. Clarify this statement.

Dfferentiale between. Template strand and Coding strand

Give the sum total of all the allelic frequencies in a stable population. List any two factors which disturb the stability of a population. How does this disturbance affect the population?

Why are biogas plants considered more beneficial in rural areas?

Removal of gonads cannot be considered as a contraceptive option. Why?

Define the following :
(a) Linkage
(b) Linkage Group
(c) Complete Linkage
(d) Incomplete Linkage

What is a vaccine? How do they act to provide long term immunity to an individual, who is vaccinated?

OR

Write the events that take place when a vaccine for any disease is introduced into the human body.

OR

How does a vaccine for a particular disease immunise the human body against that disease?

OR

Name and explain the type of immunity that is provided by injecting microbes deliberately during immunisation into the human body.

Your friend was diagnosed to be suffering from depression. Write any two symptoms that led to this diagnosis. What is its cause?

The map distance in certain organisms between gene A and B is 4 units, B and C is 2 units and between C and D is 8 units which one of these gene pairs will show more recombination frequency? Give reasons in support of your answer.