Each shake of a blanket creates a wave of energy emanating from where you are gripping the blanket. The wave travels outward, toward the far end of the blanket, while the oscillation is up and down—perpendicular to the outward direction of the wave.
The square above is based on the eye color of two parents. One of the parents has brown eyes and carries the recessive gene for green eyes (a). What is the probability that a biological child of these parents will have brown eyes?