Calvin's Father Has Red-Green Colour Blindness,but His Mother Does Not

Multiple Choice

Calvin's father has red-green colour blindness,but his mother does not carry the allele for this trait.What can you predict about the colour vision of Calvin and his three sisters?

A) Calvin is colour blind and all his sisters have normal colour vision.
B) Calvin has normal colour vision and all of his sisters are colour blind.
C) Calvin and his sisters are all colour blind.
D) Calvin and his sisters all have normal colour vision.