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Question

A family has five girls and no son, the probability of the occurance of son in 6th child is

A
1/2
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B
1/5
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C
1
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D
1/4
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Solution

The correct option is A 1/2
Human male has 44+XY chromosomes and human female has 44+XX chromosomes.
Parent generation : 44+XY x 44+XX
gametes
44+XY----->
44+XX
23+X23+Y
23+X
44+XX
44+XY
23+X44+XX 44+XY
F1 generation = 1 girl : 1 boy. Hence, the probability of a child to be son is 1/2. Option A is the correct answer.

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