(C) Polytene chromosomes radiate as $5$ long and $1$ short arm from a deeply staining and more or less amorphous structure called the chromocentre.Thi

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(C) Polytene chromosomes radiate as $5$ long and $1$ short arm from a deeply staining and more or less amorphous structure called the chromocentre.This chromocentre is formed by the fusion of the centromeric regions of all the chromosomes and,in males,the entire $Y$-chromosome.