In idiogram, chromosomes of an organism are arranged according to their

Increasing size

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Decreasing size

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Position of centromere

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Number of chromosomes

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Solution

The correct option is A Decreasing size
Idiogram refers to the diagrammatic representation of a chromosome complement or karyotype (is the number and appearance of chromosomes).
It is the representation based on chromosome size (decreasing size- largest first), the ratio between chromosome arms and patterns of heterochromatic bands.
So, the correct answer is 'Decreasing size'.

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