Color-blindness is an X-linked recessive condition. A man with normal vision is married to a woman with normal vision, but whose dad is color-blind. The couple has a child with Klinefelter Syndrome (NOT the extreme type), and who is also color-blind. Where did the non-disjunction occur

The non disjunction occurs due to the presence of extra X.

Explanation:

Klinefelter Syndrome is known or can be described as a situation in boys and men which normally resulted to the formation of small testicles. In this case, the testicles usually look smaller than normal size, and actually affects the production of testosterone.

It has been discovered that Klinefelter Syndrome only occurs in male, and usually manifest in the adulthood stage.

It is known to be caused by an extra X gene, which makes it to be XXY.

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