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(B) Thomas Hunt Morgan conducted experiments on Drosophila melanogaster to study linkage and recombination.In cross $I$,the genes for yellow body $(y)

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$1.3\%$ and $37.2\%$

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(B) Thomas Hunt Morgan conducted experiments on Drosophila melanogaster to study linkage and recombination.In cross $I$,the genes for yellow body $(y)$ and white eyes $(w)$ are tightly linked,resulting in a low frequency of recombination,which is $1.3\%$.In cross $II$,the genes for white eyes $(w)$ and miniature wings $(m)$ are loosely linked,resulting in a higher frequency of recombination,which is $37.2\%$.Therefore,the percentage of recombinants produced in cross $I$ and cross $II$ are $1.3\%$ and $37.2\%$ respectively.

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