Which cells contain only one sex chromosome
Sex Chromosomes X-O. National Library of Medicine. They only have 23 chromosomes each. In fact, many are linked to disorders such as hemophilia, Duchenne muscular dystrophy, fragile-X syndrome and several others. Hemophilia and color blindness are both sex-linked disorders. The paired genes, one from each parent, carry the plans for the same part of the body. They are made of protein and one molecule of DNA, which contains an organism's genetic instructions, passed down from parents.