Reproductive Health — BIOLOGY STD 12 Science — Question

What is point mutation? Give one example.

How is rabies caused? Write its symptoms and control measures.

A vector is engineered with three features which facilitate its cloning within the host cell. List the three features and explain each one of them.

Given below is a sequence of steps of transcription in a eukaryotic cell. Answer the following questions:

i. Fill up the blanks (A, B, C and D) left in the sequence.
ii. Why hnRNA is required to undergo splicing?

Suggest four advanced ex-situ methods to conserve threatened biodiversity.

The human male never passes the gene for haemophilia to his son? Why is it so?

Describe the technique that can help a healthy married woman, who is unable to produce viable ova, but wants to bear a child.

If one induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why?

A relevant portion of B-chain of haemoglobin of a normal human is given below:

The codon for the sixth amino acid is GAG. The sixth codon GAG mutates to GAA as a result of mutation 'A' and to GUG as a result of mutation 'B'. Haemoglobin structure did not change as a result of mutation 'A', whereas haemoglobin structure changed because of mutation 'B', leading to sickle-shaped RBCs. Explain giving reasons how could mutation 'B' change the haemoglobin structure or bring down mutation and not mutation 'A'.

How did Eli Lilly synthesis the human insulin? Mention one difference between this insulin and the one produced by the human pancreas.###What is genetically engineered insulin?