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Which of the following individuals should be crossed with a true-breeding parent of genotype X/X $\cdot$ Y/Y $\cdot$ z/z to develop ${F}_{1}$ offspring that can then be test-crossed to determine the mapping order of the genes x, y, and z?

A

X/X $\cdot$ Y/Y $\cdot$ z/z.

B

X/X $\cdot$ y/y $\cdot$ z/z.

C

x/x $\cdot$ y/y $\cdot$ z/z.

D

x/x $\cdot$ y/y $\cdot$ Z/Z.

E

x/x $\cdot$ Y/Y $\cdot$ z/z.

F

x/x $\cdot$ Y/Y $\cdot$ Z/Z.

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