We know that a mutated gene, which is dominant, is responsible for the disease osteogenesis imperfecta type II. Let the letter D represent the osteogenesis imperfecta type II gene, and d represent the normal gene.
Which of the following genotypes correctly describes a female who is has the disease, but is heterozygous for it?
A. XXDd
B. XXdd
C. XYDd
D. XXDD
E. XYDD
