old_contents: from django.contrib import admin
  from vdw.genome.models import Genome, Genotype
  
  
  admin.site.register(Genome)
  admin.site.register(Genotype)
  
new_contents: from django.contrib import admin
  from vdw.genome.models import Genotype
  
  
  admin.site.register(Genotype)
  
subject: Remove reference to Genome model in genome admin