Question

If both parents of a male child are
normal for color vision, what are
the chances of the child being
colour blind?

a)It is impossible.
b)it is possible only if father:s mother was color blind.
c)It is possible only if mother's father was color blind.
d)It is possible even when all the
four grand parents had normal vision.
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Answer 1

Answer:

d) it is possible even when all the four grand parents had normal vision

Explanation:

as colour blindness is not only caused genetically, it is possible to be colour blind even if the four grand parents have normal vision.