A man with Klinefelter syndrome XXY is found to be colourbli

A man with Klinefelter syndrome (XXY) is found to be colour-blind (an X-linked recessive phenotype). Both his parents had normal vision.

a) Explain the stimultaneous origin of Klinefelter syndrome and color blindness by the abnormal behaviour of chromosome at meiosis.

b) Can your explanation distinguish whether the abnormal chromosomal behaviour occured at the first or second division of meiosis?

Solution

The question it self is a blender. Because, if the parents have normal vision, In of XXY, the Y chromosome came from father. The two X chromosomes might came from mother. Here the Mother had normal vision means she might act as a carrier (Xx). The the same is present in the a man with  Klinefelter syndrome the genotype would me XxY. Due to presence of Normal X chromosome surely he should have a normal vision.

There is an another chance, that the X chromosome might came form father along with Y chromosome, at this chance the father should have color blindness. But here the father had normal vision. So Check your question once and get me back.