The nucleolar organizer is a ...... .

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(B) The nucleolar organizer region $(NOR)$ is a specific chromosomal region that contains the genes for ribosomal $RNA$ $(rRNA)$.In chromosomes,the pr

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Secondary constriction

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(B) The nucleolar organizer region $(NOR)$ is a specific chromosomal region that contains the genes for ribosomal $RNA$ $(rRNA)$.In chromosomes,the primary constriction is the centromere,which is involved in spindle fiber attachment.Secondary constrictions are regions other than the centromere that are constant in their position.The nucleolar organizer is located at a secondary constriction on specific chromosomes.

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