T.H.Morgan and his colleagues found that among the offspring of genetic crosses,parental phenotypic classes were the most frequent,while recombinant classes occurred less frequently.This observation led Morgan to conclude that

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Morgan's observation that recombinant classes occurred less frequently than parental phenotypic classes indicates that some genes assort together, or are linked. This suggests that certain alleles of different genes are physically located close to each other on the same chromosome and are therefore likely to be inherited together.

THMorgan and His Colleagues Found That Among the Offspring of Genetic