A normal woman whose father was colour blind, is married to a normal man. The sons would be
$75\%$ colour blind
$50\%$ colour blind
all normal
all colour blind
Most studies on human genetics have been made through
A colour blind man marries the daughter of a colour blind person. Then in their progeny
The most striking example of point mutation is found in a disease called
Assertion : Haemophilia is a recessive sex linked disease.
Reason : Haemophilia occurs due to mutation of a structural gene on chromosome $15$.
A colourblind daughter is born when
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