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A single human cell has approximately two-metre-long thread of DNA distributed among its forty-eight chromosomes.

A few chromosomes have non-staining secondary constrictions at a constant location. This gives the appearance of a small fragment called the satellite.

External morphology of all chromosomes of a cell which is specific for each species of living organisms is called idiogram.

Sex chromosomes are placed at the beginning in every idiogram.

answer is B.

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Detailed Solution

A few chromosomes have non-staining secondary constrictions at a constant location. This gives the appearance of a small fragment called the satellite.
A single human cell has approximately two-metre-long thread of DNA distributed among its forty-six chromosomes.
Idiogram is the diagrammatic representation of karyotype showing all the morphological feature of the chromosomes grouped on the basis of position of centromere and ordered in a series of decreasing size.
Sex chromosomes are placed at the last in every idiogram.

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