docs: def is_homozygous(self, individual=None):
          """This will give a boolean list corresponding to whether each individual
          is homozygous for the alternative allele.
  
          """
          if individual is not None:
              if isinstance(individual, str):
                  individual = self.individuals[individual]
              alts = self.genotype[individual]
              return [sum(alts) == len(alts)] if sum(alts) > 0 else [False]
          else:
              return [sum(alts) == len(alts) if sum(alts) > 0 else False for i, alts in self.genotype.iteritems()]