There is only one kind of egg cell produced sexually, which contains X chromosome; If the egg cell containing X chromosome is fused with the sperm containing X chromosome, then the sex chromosome of the fertilized egg is XX, and the child developed from it is a girl; If the egg with X chromosome and the sperm with Y chromosome are fused, then the sex chromosome of the fertilized egg is XY, and the child developed from it is a boy. The gene map is as follows:
As can be seen from the picture, the chromosome inherited by the boy's father is Y; The sex chromosome given to him by his mother is X, so Dongdong is a healthy boy, and his father inherited 22 chromosomes+Y.
So choose C.