<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load_genotypes(self):
 """This really just intializes the file by opening it up. """


        if DataParser.compressed_pedigree:
            self.genotype_file = gzip.open("%s.gz" % self.tped_file, 'rb')
        else:
            self.genotype_file = open(self.tped_file)
        self.filter_missing()