Which structural part of a chromosome may occur either in the middle or at any one end of the Chromosome?
(a) Telomere
(b) Nucleolar Organizer
(c) Satellite
(d) Centromere
(d) Centromere
Explanation:
The centromere is the constricted region of a chromosome that connects two sister chromatids. It can be located at different positions along the length of a chromosome, which determines the chromosome’s shape. The centromere may be in the middle (metacentric), near one end (submetacentric or acrocentric), or at the terminal end (telocentric). The centromere is also the attachment site for spindle fibers during cell division. Other parts like telomeres are found at the ends of chromosomes, satellites are small chromosomal segments beyond secondary constrictions, and the nucleolar organizer is a region associated with rRNA gene clusters.
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