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(B) In $Mendelian$ genetics, independent assortment predicts a specific ratio of recombinant types. When genes are located on the same chromosome, the

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Incomplete linkage

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(B) In $Mendelian$ genetics, independent assortment predicts a specific ratio of recombinant types. When genes are located on the same chromosome, they tend to be inherited together, a phenomenon known as linkage. In $Incomplete$ $linkage$, crossing over occurs, resulting in some recombinant progeny, but the frequency of these recombinants is significantly lower than what would be expected if the genes were assorting independently. Therefore, when the number of recombinant progeny is less than the expected value, it indicates the presence of linkage, specifically $Incomplete$ $linkage$.

When the number of recombinant progeny is usually less than the number expected in independent assortment, it is called:

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