(D) The haploid chromosome number $(n)$ is given as $12$.Therefore,the diploid chromosome number $(2n)$ is $2 \times 12 = 24$.Monosomy is a type of an

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(D) The haploid chromosome number $(n)$ is given as $12$.Therefore,the diploid chromosome number $(2n)$ is $2 \times 12 = 24$.Monosomy is a type of aneuploidy where one chromosome is missing from the diploid set,represented as $(2n - 1)$.Substituting the value of $2n$,we get $24 - 1 = 23$.Thus,the monosomic number is $23$.