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User: The different forms of a gene are called __________ A. alleles. B. factors. C. masks. D. traits.ALLELES. The different forms of a gene are called A. alleles.. factors. C. masks. D. traits. ALLELES. The different forms of a gene are called A. alleles.
1 Since human cells carry two copies of each chromosome they have two versions of each gene. These different versions of a gene are called alleles.  Alleles can be either dominant or recessive.