The following points highlight the two main adaptational forms of chromosomes. The forms are: 1. Polytene Giant Chromosomes 2. Lampbrush Chromosomes. Form # 1. Polytene Giant Chromosomes: Polytene giant chromosomes are normal interphase chromosomes where homologues become paired and undergo several replications; all the copies so produced remain associated together. Polytene giant chromosomes are typically […]
Adaptational Forms of Chromosomes
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Molecular Structure of Centromere
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In this article we will discuss about the molecular structure of centromere. Eukaryotic chromosomes possess a segregational device called centromere which is responsible for the chromosomc movement during cell division. Chromosome fragments without a centromere (acentric fragments) are unable to move to any of the poles during cell division; as a result, they are excluded […]
Structure and Synthesis of Telomere
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In this article we will discuss about the structure and synthesis of telomere. Structure of Telomere: Molecular genetic studies have shown that the telomere consists of several short sequences which are tandemly repeated (Table 8.8). The general formula for the composition of the repeating units in one strand of the telomeres of all the eukaryotes […]
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