Question

What is nucleolar organizer and its function?

Answer 1

A nucleolar organizer can be described as a part of a chromosome which is associated with the formation of nucleolus.

• Those specific regions on a chromosome, which re responsible for the formation of interphase nucleoli are referred to as nucleolar organizer.
• The function of the nucleolar organizer is to form the nucleolus region.
• In humans, we can specifically find the nucleolar organizer on the shorter arms of the chromosome numbered  13, 14, 15, 21,22.

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Answer 2

Explanation:

Nucleolus organizer regions (NORs) are chromosomal regions crucial for the formation of the nucleolus. In humans, the NORs are located on the short arms of the acrocentric chromosomes 13, 14, 15, 21 and 22, the genes RNR1, RNR2, RNR3, RNR4, and RNR5 respectively. These regions code for 5.8S, 18S, and 28S ribosomal RNA.