Different varieties of the same gene are called

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Genotypes

Sib pairs

Alleles

Isomers

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UPSC NDA-2 – 2021

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Alleles are different versions or forms of the same gene. They arise through mutations and are located at the same position (locus) on homologous chromosomes.

For example, the gene for flower color might have two alleles: one for purple flowers and one for white flowers. These different alleles determine the variation in traits observed within a population.

Genotype refers to the genetic makeup of an organism, i.e., the combination of alleles it possesses for a particular trait or set of traits. Sib pairs are simply siblings. Isomers are chemical compounds with the same molecular formula but different structural formulas.

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