Frank and Maria both have normal vision. After they married, they had two daughters and a son. Both daughters have normal vision and never had children. Marco, the son, is color blind. He married Lauren, who has normal vision. Marco and Lauren had two children, Caleb and Molly. Caleb is not color blind, but Molly is. Color blindness is a sex-linked recessive trait (carried on the X chromosome). The diagram below shows the family tree, but is not shaded to show the passage of this trait. Which statement about this family’s pedigree is correct?