Question

Of both normal parents, the chance of a male child becoming colourblind are ______.

Options

• no

• possible only when all the four grand parents had normal vision

• possible only when father’s mother was colourblind

• possible only when mother’s father was colourblind

Answer 1

Of both normal parents, the chance of a male child becoming colourblind are possible only when mother’s father was colourblind.