If an organism's parents if it is heterozygous for a certain trait the parents supplied different alleles.
Any offspring's genotype is determined by the equal contribution of alleles from both parents. As a result, even when an organism is heterozygous, it is clear that the allele pair expressing the trait (due to the heterozygous pair) is formed by the equal contribution of both parents, which means that one allele is given by one parent and the other allele is given by the other parent.
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