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(C) Thomas Hunt Morgan performed dihybrid crosses in Drosophila to study linkage and recombination.In Cross $A$ (yellow-bodied,white-eyed with wild ty

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$98.7\% \quad 1.3\% \quad 62.8\% \quad 37.2\%$

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(C) Thomas Hunt Morgan performed dihybrid crosses in Drosophila to study linkage and recombination.In Cross $A$ (yellow-bodied,white-eyed with wild type),the genes for body color $(y)$ and eye color $(w)$ are tightly linked. The parental types $(P)$ are $98.7\%$ and the recombinant types $(Q)$ are $1.3\%$.In Cross $B$ (white-eyed,miniature-winged with wild type),the genes for eye color $(w)$ and wing size $(m)$ are loosely linked. The parental types $(R)$ are $62.8\%$ and the recombinant types $(S)$ are $37.2\%$.Therefore,the proportions are $P = 98.7\%, Q = 1.3\%, R = 62.8\%, S = 37.2\%$.This matches option $C$.

The following experiment is the result of a dihybrid cross performed by Morgan. Identify the proportions of $P, Q, R,$ and $S$.

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