Question

If a father and son are both defective in red - green colour vision, is it likely that the son inherited the trait from his father? Comment.

Answer 1

The son would not have inherited the trait from his father because the gene for red- green colour blindness is located on the X - chromosome. The son receives only Y chromosome from the father. Hence the gene is inherited from hia mother who is a carrier or a colourblind by herself.