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Alleles are: 1) two copies of a gene 2) located next to one another on a chromosome 3) the names for the two chromosomes in a
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Option A

Allele is two copies of a gene.

Allele is considered as varient form of gene.

An organism may have same allele of a gene or different allele.One copy of gene is inhereted from a parent and another with a another parent.In two copies, one copy from each parent.As if a gene have two different copies it is called as allele.

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