What is the genotype of the mother in the Huntington disease having a dominant of DD or Dd inheritance pattern?

In Huntington's disease, which follows a dominant inheritance pattern, the mother's genotype could either be homozygous dominant (DD) or heterozygous (Dd). If she has the disease, she must have at least one dominant allele, so her genotype cannot be homozygous recessive (dd). Therefore, her possible genotypes are DD or Dd, which both indicate she has the potential to pass the disease on to her offspring.