section_path: Reproduction/Unisexual reproduction
section_name: Unisexual reproduction
paragraph_text: Unisexual reproduction
  
  Unisexual female mole salamanders (genus Ambystoma) are common in the Great Lakes region of North America. These salamanders are the oldest known unisexual vertebrate lineage, having emerged about 5 million years ago. Genome exchange can sometimes occur between the unisexual female Ambystoma and males from sympatric sexual species.