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

How many types of restriction endonucleases are found. Why they are called as molecular scissors?

 Answer the following:

1. What are IUDs?
2. List out its types with examples.
3. How do they prevent conception?

Mendel crossed plants that breed true for yellow seeds with plants that breed true for green seeds. All seeds in F-generation were yellow. Work out the inheritance involved in this cross by using symbols for each traits and state which trait was dominant?

Describe the experiments that established the identity of 'transforming principles' of Griffith.

Trace the development of female gametophyte (embryo sac) from megaspore mother cell in a flower. Give a labelled diagram of the final stage of female gametophyte.

Mention three uses of PCR.

Explain giving one example, how co-extinction is one of the cause of biodiversity loss? List the other three causes also.

Give two examples of each:

1. Terrestrial ecosystem.
2. Aquatic ecosystem.
3. Man-made ecosystem.

Given below is the representation of amino acid composition of the relevant translated portion of b-chain of haemoglobin, related to the shape of human red blood cells.

1. Is this representation indicating a normal human or a sufferer from certain related genetic disease? Give reason in support of your answer.
2. What difference would be noticed in the phenotype of the normal and the sufferer related to this gene?
3. Who are likely to suffer more from the defect related to the gene represented – the males, the females or both males and females equally? Andwhy?

Explain Commensalism interaction of population with different examples