A: Morgan's cross III was conducted in Drosop | vedclass

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(C) Thomas Hunt Morgan conducted various crosses in $Drosophila$ to study sex-linked inheritance. The assertion is correct as Morgan performed specifi

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Assertion is correct, but Reason is incorrect.

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(C) Thomas Hunt Morgan conducted various crosses in $Drosophila$ to study sex-linked inheritance. The assertion is correct as Morgan performed specific crosses to map the gene for white eye color on the $X$-chromosome. The reason provided is incorrect because the cross described (red-eyed hybrid female $	imes$ white-eyed male) is a test cross or a specific mating pattern, but it does not accurately describe the fundamental cross used to establish the linkage of the white-eye gene to the $X$-chromosome in the context of his classic experiments. Therefore, the Assertion is correct, but the Reason is incorrect.

$A$: Morgan's cross $III$ was conducted in $Drosophila$ to locate genes on the chromosome for white eye color.
$R$: The cross was done between red-eyed hybrid female and white-eyed male.

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$A$: Morgan's cross $III$ was conducted in $Drosophila$ to locate genes on the chromosome for white eye color. $R$: The cross was done between red-eyed hybrid female and white-eyed male.