Human Reproduction — BIOLOGY STD 12 Science — Question

Explain innate immunity

Expand 'BAC' and 'YAC'. Explain how they were used in sequencing of human genomes.

Identify a, b, c, d, e and f in the table given below:

S. No.	Organism	Bioactive molecule	Use
A.	Monascus purpureus (yeast)	a	b
B.	c	d	antibiotic
C.	e	Cyclosporin A	f

In a sea shore, the benthic animals live in sandy, muddy and rocky substrata and accordingly developed the following adaptations.

1. Burrowing.
2. Building cubes.
3. Holdfasts/ peduncle.

Find the suitable substratum against each adaptation.

A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.

1. Represent this cross in the form of a pedigree chart. Give the genotypes of the daughter and her husband.
2. Write the conclusion you draw of the inheritance pattern of this disease.

Explain aquatic ecosystem by taking example of small pond.

Although Mendel published his work on inheritance of characters in 1865, for several reasons, it remained unrecognised till 1900. Explain giving three reasons, why it did take so long.

Write any five common antibiotics with their sources.

A doctor prescribed morphine as a sedative and pain killer to your cousin who had undergone surgery. Even after recovery, he craved for the prescribed medicine. What do you conclude about his condition, had he continued with the same medication? After appraising yourself, what measures will you suggest to him to overcome this problem? Briefly explain any two.