Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

1. Expand VNTR and describe its role in DNA fingerprinting.
2. List any two applications of DNA fingerprinting technique.

Name the insect pest that is killed by the products of cry I Ac gene. Explain how the gene makes the plant resistant to the insect pest.

What is the significance of ampullary–isthmic junction in the female reproductive tract?

Classify the following as examples of homology and analogy:

(i)	Mouth parts of cockroach and butterfly
(ii)	Hearts of rabbits and human beings
(iii)	Eyes of octopus and mammals
(iv)	Sweet potato and potato
(v)	Stings of honey bee and scorpion
(vi)	Tendrils of Lathyrus and tendrils of Gloriosa

Microbes are used for industrial production on a large scale. Explain with examples.

Why is the frequency of red-green color blindness is many times higher in males than that in females?

Explain how and why controlled breeding experiment is carried out in cattle.
OR
Define artificial insemination. What are its advantages over conventional breeding?

How does a mutagen induce mutation? Explain with example.

Two types of aquatic organisms in a lake show specific growth patterns as shown below, in a brief period of time. The lake is adjacent to an Time - agricultural land extensively supplied with fertilisers. Answer the questions based on the facts given above.

1. Name organisms depicting patterns A and B.
2. State the reason for the growth patterns seen in A.

A burglar in a huff forgot to wipe off his blood-stains from the place of crime where he was involved in a theft and fight. Name the technique which can help in identifying the burglar from the blood-stains. Describe the technique.