Human Reproduction — BIOLOGY STD 12 Science — Question

Explain the inheritance of hemophilia?

Where does triple fusion take place in a flowering plant? Why is it so called? Mention its significance.

You are repeating the Hershey-Chase experiment and are provided with two isotopes: ³²P and ¹⁵N (in place of ³⁵S in the original experiment). How do you expect your results to be different?

Draw a diagram of a typical agarose gel electrophoresis, showing migration of undigested and digested sets of DNA fragments. Label:

1. The digested and undigested DNA fragments.
2. Anode and cathode ends of the plate Mention the role of electrophoresis in biotechnology.

1. Give one example each of albuminous and non albuminous seeds.
2. Name the parts of the ovule and the embryo sac of an angiosperm that develop into.

1. Perisperm.
2. Seed coat.
3. Endosperm, and.
4. Embryonal axis.

Copper ions-releasing IUDs are more efficient than non-medicated methods. Why?

Explain the pattern of inheritance of haemophilia in humans. Why is the possibility of a human female becoming a haemophilic extremely rare? Explain.

Explain how biodiversity is important for human.

Rohan saw Mr. Sharma collecting different plant specimens. He was confused to see him doing this collection and approached him asking about it.
Mr. Sharma told him that he will cross different plant specimens in his laboratory for obtaining better varieties of plants.

1. Why is he interested in such experiments?
2. Name this technique.
3. What precautions he should take while applying this technique?
4. What values are shown by Rohan?