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  4. X-linked recessive gene is

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Q. X-linked recessive gene is

MP PMTMP PMT 2007Principles of Inheritance and Variation

Solution:

X-linked recessive characters are expressed only when they are present on X chromosome of male. Recessive characters cannot be expressed over dominant characters. As males have only one X chromosome so if recessive character is present it will always be expressed. There is no other X chromosome in male and Y chromosome does not possess genes which can influence the genes present on X chromosome. Females express X-linked recessive genes only when they are present on both X chromosomes.