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Who introduced the chromosomal theory of inheritance?

Sutton and Boveri proposed the chromosomal hypothesis of inheritance, which holds that genes are present on chromosomes and that homologous chromosomes separate during anaphase-I of meiosis, causing the segregation of alleles of a gene controlling the contrasting qualities, was first put forth in 1903. 

According to this notion, particular genes are located at particular places on particular chromosomes.