What is an allele?

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A. An organism that lives in eukaryotes

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B. A group of chromosomes

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c. A gene that causes a specific trait

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D. A chromosome that determines gender

Answer: Just did the lesson on this, the answer is C.

Explanation:An allele is one of the possible forms of a gene. Most genes have two alleles, a dominant allele and a recessive allele. If an organism is heterozygous for that trait, or possesses one of each allele, then the dominant trait is expressed ... So a gene is a particular region of your DNA that controls a specific trait.