Klinefelter syndrome?
How could a phenotypically normal man and a phenotypically normal female have a son with Klinefelter syndrome who also has the red form of color blindness? please answer in detail.
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A phenotypical male is XY
A phenotypical female is XX
A Klinefelter's male is phenotypically XXY
When sperm or ovem (eggs) [haploid cells] are produced in the parents on of then devides wrongly so that in stead of a sperm carrying an X or a Y, one carries an XY and another is empty OR an egg will carry XX or is empty instead of the 2 eggs each carrying an X.
When one of these haploid cells join with a normal haploid cell to for an embryo, the new diploid cell has 47 chromasones instead of 46 and is XXY.
Red-Green colour blindness is also sex linked, the gene is carried on the X chromasone so either the mother is red-green colour blind or she is a carrier and the father is gre-green colour blind.