With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Gone with the Wind cast Clark Gable.
text_B: The term transheterozygote is used in modern genetics periodicals in two different ways .. In the first , the transheterozygote has one mutant and one wildtype allele at each of two different genes -LRB- A -  /  A + and B -  /  B + where A and B are different genes -RRB- .. allele. allele. genes. genes. In the second , the transheterozygote carries two different mutated alleles of the same gene -LRB- A *  /  A ' , see example below -RRB- .. This second definition also applies to the term `` heteroallelic combination '' .. Organisms with one mutant and one wildtype allele at one locus are called simply heterozygous , not transheterozygous .. allele. allele. heterozygous. heterozygous. Transheterozygotes are useful in the study of genetic interactions and complementation testing .. genetic interactions. epistasis. complementation. complementation ( genetics )
not_related.