Humans have one of two types of hairlines on their foreheads. The "V" shaped hairline refers to a trait called Widow's Peak (W) that is dominant over a straight hairline (w). If Chris has the genotype WW and Janet has the genotype ww, what can we say about their four children? All of their children would have a straight hairline.

All of their children would have a widow's peak hairline.

Half of their children would have a straight hairline and half would have a widow's peak hairline.

Three of the children would have a widow's peak hairline and one would have a straight hairline.