Final answer:
Alleles are different forms of a gene that determine traits in an organism based on their dominance relationship.
Explanation:
Alleles are different forms of a gene that occupy the same position on a chromosome. An individual inherits one allele from each parent, resulting in a genotype that can be homozygous (two identical alleles) or heterozygous (two different alleles). The dominance relationship between alleles determines the expression of certain traits in an organism.
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