Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Enzymes play an important role in detergents that we use for washing clothes. These enzymes are obtained from some unique microorganisms, enlist atleast two of them. Also name the enzyme.

Draw a schematic sketch of pBR322 plasmid and label the following in it:

1. Any two restriction sites.
2. ori and rop genes.
3. An antibiotic resistant gene.

If implementation of better techniques and new strategies are required to provide more efficient care and assistance to people, then why is there a statutory ban on amniocentesis? Write the use of this technique and give reason to justify the ban.

Write the functions of: Tapetum

What is the study of fossils called? Mention any three points how the fossils throw light on the past.

What do you understand by the term biopesticide? Name and explain the mode of action of a popular biopesticide. Biopesticides are methods of controlling pests that rely on natural predation rather than introduced chemicals/ or living organisms used to kill pests.

Rearrange the following in the correct sequence to accomplish an important biotechnological reaction:

1. In vitro synthesis of copies of DNA of interest.
2. Chemically synthesised oligonucleotides.
3. Enzyme DNA-polymerase.
4. Complementary region of DNA.
5. Genomic DNA template.
6. Nucleotides provided.
7. Primers.
8. Thermostable DNA-polymerase (from Thermus aquatics).
9. Denaturation of ds-DNA.

Explain the double fertilization and triple fusion. Write there importance in angiosperm plant.

State what is apomixis. Comment on its significance. How can it be commercially used?

Expand the following:

1. ART
2. GIFT
3. ICSI
4. RTI
5. IUI