(D) The total number of chromosomes in $Drosophila$ $melanogaster$ is $8$ $(2n = 8)$.These consist of $4$ pairs of chromosomes.Out of these, $1$ pair

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(D) The total number of chromosomes in $Drosophila$ $melanogaster$ is $8$ $(2n = 8)$.These consist of $4$ pairs of chromosomes.Out of these, $1$ pair is the sex chromosome ($XX$ in females, $XY$ in males).The remaining $3$ pairs are autosomes.Therefore, the number of autosomal chromosomes in $Drosophila$ is $3$ pairs.