def nextGen(currPop, distDict, numChrome, mutRate):

     genFit = {}

     for i in currPop:
         tmp = fitness(i, distDict)
         genFit[tuple(i)] = tmp
         print(tmp)

     genFitCum = dictCum(genFit)

     print(len(genFit), len(currPop))

     parentSelection = parents(genFitCum, numChrome)

     children = breedPopulation(parentSelection, numChrome)

     nextGeneration = mutatePop(children, mutRate)

     return nextGeneration