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731.

Hemophilia, a human disease, is caused by
(a)Bacterial infection
(b)Mutant gene
(c)Viral infection
(d)Fungal infection
Comment
Answer is: B

732.

A colour-blind man is married to a normal-visioned woman whose parents also had normal vision. What proportion of their children is likely to be colour-blind ?
(a)25 per cent
(b)50 per cent
(c)100 per cent
(d)0 per cent
Comment
Answer is: D

733.

The disease, sickle-cell anaemia, is caused by
(a)Malarial infection
(b)Iron deficiency
(c)Poor hygiene
(d)None of these
Comment
Answer is: D

734.

A person with which one of the following blood group is considered a universal donor ?
(a)A
(b)B
(c)AB
(d)O
Comment
Answer is: D

735.

A person with blood group AB is sometimes called a universal recipient because of
(a)Lack of antibodies
(b)The presence of antibodies
(c)Lack of antigens
(d)Lack of both antigens and antibodies
Comment
Answer is: A

736.

Phenylketonuria is a human disease. A person affected by the disease suffers from
(a)Kidney failure
(b)Mental idiocy
(c)Sexual infertility
(d)Liver failure
Comment
Answer is: B

737.

A child was found to be perfectly normal at birth.A few years later, however, his parents noticed What his activities were sluggish. He was, therefore, taken to a clinic where the doctor diagnosed him mentally retarded. What do you think he was suffering from ?
(a)Alkaptonuria
(b)Phenylketonuria
(c)Parkinson's disease
(d)Epilepsy
Comment
Answer is: B

738.

Which of the following fungi has been extensively used for genetical studies ?
(a)Green mold
(b)Pink bread mold
(c)Mushroom
(d)Bread mold
Comment
Answer is: B

739.

The fungus, Puccinia graminis, causes a serious plant disease. Which of the following crops is affected by it ?
(a)Wheat
(b)Rice
(c)Gram
(d)Maize
Comment
Answer is: A

740.

Lathyrism a human disease causing paralysis of the lower limbs, is caused by
(a)Consumption of kesari dal
(b)Viral infection
(c)Nervous failure
(d)Bacterial infection
Comment
Answer is: A

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