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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.
A normal couple produces half the sons as haemophilic and half the daughters as carriers. Choose the option that correctly indicates the chromosome on which the gene for this trait is located.
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