Sex-Linked Traits

Brittany is colorblind. Her husband, Joseph, is not. What is the phenotypic ratio of their offspring?

Jacob has hemophilia. His wife, Ella, does not. Ella’s mother had hemophilia. Ella’s father did not. What is the phenotypic ratio of Jacob and Ella’s offspring?

David is red-green colorblind. His wife is has normal color vision and does not have a family history of red-green colorblindness. What is the phenotypic ratio of their offspring?