Different alleles for a trait are known as gene variants. For example, two different alleles for the gene that determines flower color in pea plants are purple (P) and white (p). When an individual has two different alleles for a trait, it is known as heterozygous.
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An organism with two different alleles for a trait is said to be heterozygous for that trait. This means that it has one dominant allele and one recessive allele. The dominant allele will usually determine the organism's phenotype for that trait.
The trait that is not expressed in the F1 generation resulting from the crossbreeding of two genetically different true breeding organisms is called a recessive trait. It is masked by the dominant trait in the F1 generation but can reappear in subsequent generations when two recessive alleles come together.
An organism with two like genes for a trait is called homozygous for that trait.
The answer to your question, "What is an organism with 2 of the same alleles for a trait called?" is homozygous. it is just homozygous-By SciienceFreak
This is known as codominance, where both alleles for a trait are fully expressed in the phenotype of an individual.