Original: Current research has established that human beings are genetically highly homogenous ; that is , the DNA of individuals is more alike than usual for most species , which may have resulted from their relatively recent evolution or the Toba catastrophe .
Simplified: Current research has established that human beings are genetically highly homogenous . The DNA of individuals is more alike than usual for most species . This may have resulted from their relatively recent evolution or the Toba catastrophe .