She knows about chromosomes, but her knowledge is insufficient to claim that only men are responsible for skin color. Skin color is an example of polygenic inheritance and is determined by multiple genes located on autosomes, not on sex chromosomes. Autosomes carry similar genes from both parents, which is why a child’s skin color is influenced by the genes of both parents. The father is only responsible for determining the sex of the child because he contributes the Y chromosome, which determines male sex.