Q. A man with red-green color blindness marries a woman with standard vision. Their first child, a boy, is color-blind.
i) Drawing the cross above.
ii) The couple have a second child, a girl, with normal vision. This girl grows up and becomes pregnant with a child she knows to be a boy. The father of this child has normal vision. What is the possibility that this child will have red-green color blindness? Figure the cross.