Discussion
Genes which exists as alternate expressions at a particular locus is known as
Answer: C
Genes that exist as alternative forms at the same locus on a chromosome are called alleles. For example, the A, B and O forms of the ABO gene are alleles at one locus on chromosome 9.
Loci is the plural of locus and refers to the positions, not to the forms. An antigen is a molecule that provokes an immune response. A phenotype is the observable expression of the genes, such as the blood group. Only allele names the alternative forms.
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