Answer:
What percentage of the offspring will have short hair?
ANSWER 75%
What percentage of the offspring will have long hair?
ANSWER 25%
:)
Recall that a period is horizontal, and a group is vertical.
So if cobalt is moving "down" a period, it would be most logical to say that it would be Ni, or nickel. It could also be Copper, Zinc, Gallium, and so on. Make sense?