A) bacteria-related diseases
B) congenital disorders
C) pollutant-induced disorders
D) virus-related diseases
Correct Answer: B
Solution :
Both sickle-cell anaemia and Huntingdons chorea are congenital genetic disorders. Sickle-cell anaemia was first reported by James Herrick (1904). In this disease the patients haemoglobin level reduced to half of the normal and the RBCs become sickle-shaped. A single mutation in a gene can cause sickle-cell anaemia. Huntingtons chorea is caused by autosomal mutation, which is dominant. The gene is present on chromosome number 4.
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