An X-inked recessive gene causes red-green color blindness in humans. Suppose Jo

Question

An X-inked recessive gene causes red-green color blindness in humans. Suppose John and Cathy have normal color vision, Ater 10 years of mamage to John, Cathy has given birth to a color-blind a color-blind son John filed for divorce, daiming that he is not the fiather of at least one of the Which of the following statements descrbes John's patemnity dlaim? O He could be the father of both children. O He cannot be the father of Cathy's son He canot be the fater of Cary's daughter He cannot be the father of ether did OR OPrevous > Give Up & View Solden O Check Answer Net att about us careers prvacy policy serms of une coneact us hep MacBook Air 20 2 0

Explanation / Answer

Ans : He cannot be the father of cathy's daughter.

Since the red green color blindness in humans is caused by a X linked recessive gene, so the daughter to be color blind must have the recessive genes on both of her X chromosomes.

Now the John has normal vision , which means he does not possess the recessive gene on his X chromosome . So the daughter must have got one recessive gene from her mother ( who might be the carrier of the disease) , and the other recessive gene from the other man and not John.

The son might be that of john , as he has only one recessive gene , which is inherited from his mother.

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