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Problem: Thomas Hunt Morgan postulated a direct relationship between the cytological observation of crossing over in meiosis (with an apparent physical exchange of segments of homologous chromosomes) and the genetic evidence for an exchange of alleles between two homologous chromosomes. Barbara McClintock provided the definitive proof of Morgan's hypothesis. What was the crucial experiment?

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Barbara McClintock: developed methods to visualize maize (corn) chromosomes

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Thomas Hunt Morgan postulated a direct relationship between the cytological observation of crossing over in meiosis (with an apparent physical exchange of segments of homologous chromosomes) and the genetic evidence for an exchange of alleles between two homologous chromosomes. Barbara McClintock provided the definitive proof of Morgan's hypothesis. What was the crucial experiment?

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