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Question

The recessive genes located on X-chromosome in humans are always

A
Expressed in males
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B
Expressed in females
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C
Lethal
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D
Sub-lethal
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Solution

The correct option is A Expressed in males
Males are always affected due to the recessive gene on the X-chromosome as they have only a single X-chromosome and there is nothing to suppress the character and hence it will be expressed.
Whereas in females, there are two X chromosomes and can be suppressed by the other
So, the correct answer is 'Expressed in males'

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