The best replacement for genes is alleles.

The best alternatives to genes are rated as following:
★★★★★  alleles
★★★★★  environment
★★★★  chromosomes
★★★  dna
★★  traits
★★  upbringing
★  proteins
★  bad luck
★  good docs
★  jeans
★  heredity
★  lifestyle
★  recessive genes
★  memes
★  genome
★  white genes
  genotype
  family environment
  multiple alleles
  genetics
  in the jeans
  intrauterine environment
  dominant genes
  non linked genes
  chromosomes and alleles
  nurture

Your alternative for genes is not listed? Suggest!
Speaking about genes, one probably shouldn't forget about incomplete dominance.

Other search terms related to genes and their ratings are:
★★★★★ incomplete dominance
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genes
alleles
environment