(D) $G. hirsutum$ is an American (New World) crop which is tetraploid,having $26$ pairs of chromosomes.It is believed to have originated through hybri

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(D) $G. hirsutum$ is an American (New World) crop which is tetraploid,having $26$ pairs of chromosomes.It is believed to have originated through hybridization between an Asiatic diploid cotton species (having $13$ pairs of large chromosomes) and an American cotton species (having $13$ pairs of small chromosomes).