In a family of four including a normal mother, a normal father, a color blind son and a normal son; who do you think has the defective X gene other than the affected son?(a) The mother(b) The father(c) The normal son(d) The effected son onlyI had been asked this question during an online interview.Asked question is from Sex Linked Inheritance topic in division Chromosomes and Sex Determination of Cytogenetics

In a family of four including a normal mother, a normal father, a colo

1.	In a family of four including a normal mother, a normal father, a color blind son and a normal son; who do you think has the defective X gene other than the affected son?(a) The mother(b) The father(c) The normal son(d) The effected son onlyI had been asked this question during an online interview.Asked question is from Sex Linked Inheritance topic in division Chromosomes and Sex Determination of Cytogenetics
Answer» Right answer is (a) The mother The explanation is: Males have only one X chromosome, so if the father or NORMAL son CARRIED the defective X gene they would show the PHENOTYPIC effect. Since the female has two copies of X chromosome, only in homozygous form the recessive gene like COLORBLINDNESS is EXPRESSED. So mother here is a carrier.

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