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Question
If normal parents have a colour blind son, the probability that he inherited the gene for colour blindness from his mother is
If normal parents have a colour blind son, the probability that he inherited the gene for colour blindness from his mother is
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Solution
The correct option is E 100%
Color blindness is a genetic disorder associated with X-linked chromosome. In case of female child, she will be affected only if the male parent is color blind and the female parent is carrier/color blind. In general sense for a female child (XX) if the second X chromosome is normal (i.e carries a normal color coding gene) then she will not display the affect of the genetic mutation and will be a dormant carrier, but since Y chromosome has entire different set of genes (i.e Y doesn't contain color coding genes) it is not possible. Hence, if a male child is color blind the inheritance of this disease will be linked to the mother completely. The correct answer is, therefore, 100%.
Color blindness is a genetic disorder associated with X-linked chromosome. In case of female child, she will be affected only if the male parent is color blind and the female parent is carrier/color blind. In general sense for a female child (XX) if the second X chromosome is normal (i.e carries a normal color coding gene) then she will not display the affect of the genetic mutation and will be a dormant carrier, but since Y chromosome has entire different set of genes (i.e Y doesn't contain color coding genes) it is not possible. Hence, if a male child is color blind the inheritance of this disease will be linked to the mother completely. The correct answer is, therefore, 100%.
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