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(C) In $Drosophila$,sex is determined by the ratio of $X$ chromosomes to the number of sets of autosomes $(A)$.$A$ gynandromorph is an organism that c

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$Y$ chromosome plays no role in sex determination.

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(C) In $Drosophila$,sex is determined by the ratio of $X$ chromosomes to the number of sets of autosomes $(A)$.$A$ gynandromorph is an organism that contains both male and female tissues.This occurs due to the loss of one $X$ chromosome during an early mitotic division in a developing $XX$ (female) zygote.As a result,some cells remain $XX$ (female),while others become $X0$ (male).This phenomenon demonstrates that the $X$ chromosome is the primary factor in sex determination,while the $Y$ chromosome does not determine sex in $Drosophila$ (it is only required for male fertility).

Which of the following best explains the formation and cellular basis of gynandromorphs in $Drosophila$?

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