What is an organism that has two different alleles for a trait?

An organism in which the two copies of the gene are identical — that is, have the same allele — is called homozygous for that gene. An organism which has two different alleles of the gene is called heterozygous.
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What is an allele whose trait always shows up in the organism when the allele is present?

the set of information that controls a trait; a segment of DNA on a chromosome that codes for a specific trait. an allele whose trait always shows up in the organism when the allele is present. an allele that is masked when a dominant allele is present.

Updated: 24th September 2018

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