What is the difference between a gene and an allele? a. a gene is a form of a trait, and alleles make up genes. b. a gene is a sequence of bases in a dna molecule, and an allele is an alternative version of a gene that codes for the same feature. c. a gene is a sequence of bases in a dna molecule, and an allele is an alternative version of a gene that codes for a different, but related, feature. d. a gene describes a chromosome, and an allele describes an exact location of a gene on a chromosome. e. an allele and a gene are the same thing?