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Assertion (A): A male individual always inherits haemophilia from his mother. Reason (R): The gene for haemophilia lies on X-chromosome.
Student to attempt either option-(A) or (B) :
What is a test cross ? How can we find out the zygosity of a plant by the use of test cross ?
Why are human females rarely haemophilic ? Explain with the help of a cross. Under what conditions can a haemophilic female be born ? How do haemophilic patients suffer ?
Name the two events 'a' and 'c' shown in the diagram below. (i) Mention where in the cell these events take place. (ii) Explain the changes taking place during event 'b' and mention why these are needed.
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