Which is an example of a phenotype: brown hair OR brown hair allele?

In a Punnett square for a trait (X/x) that is autosomal and inherited by the dominant allele. The father does not have it (xx), but the mother does (Xx). If they had two children, a son and a daughter, would the  Punnett square show the son have the trait, would the daughter have the trait, each have a 50% or both not have the trait.

Skin color in humans is determined by a polygenic inheritance system. The husband is white while the wife is of Nigerian heritage. However, their two children are all light-skinned. How were the married couples able to have light-skinned babies. Are the odds to have a light-skinned baby one in a million? What are the possible genotypes of the husband and the wife and their children.

Having a pointed hairline, or Widow’s Peak, is controlled by a dominant allele, while a curved or straight hairline is recessive. Determine the phenotypes for both you and your partner.  What genotypic and phenotypic ratios would you expect in your offspring?