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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.
Genes are segments of DNA arranged along a chromosome. A single chromosome can have hundreds or even thousands of genes. Most sexually reproducing organisms, like people and pigeons, have two copies of each chromosome, called homologous chromosomes. Humans have 23 chromosome pairs, or 46 chromosomes in all. Homologous chromosomes have the same genes arranged in the same order, but they have slightly different DNA sequences. Different versions of the same gene are called alleles (uh-LEELZ); homologous chromosomes often contain different alleles.