Answer:
It helps people prepare for situations that can come unexpectedly so they know what to do and how to act
It really depends, think of it as 2 light bulbs in each parent. if both light bulbs in both parents are switched on that means their genes that they inherited are only able to have brown eyed babies, although if just 1 of the 4 light bulbs are not on it allows the baby to have blue eyes.
Drugs and other things can be involved
