Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-flies for his experiments? State any three reasons.
Why are color-blindness and thalassaemia categorised as Mendelian disorders? Write the symptoms of these diseases seen in people suffering from them.
A colour-blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.
(a) Why are thalassemia and haemophilia categorized as Mendelian disorders? Write the symptoms of these diseases. Explain their pattern of inheritance in humans.
(b) Write the genotypes of the normal parents producing a haemophilic son.
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