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Why not one chromosome to house genome in organisms but multiple? Is it for epigenomic purposes?

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  • $\begingroup$ Are you asking about ploidy number or chromosome number? Do you have any reason for expecting every organism ro only have a single chromosome? Why did you suggest epigenetics? What are your thoughts? $\endgroup$ – Remi.b Jan 28 at 18:44
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    $\begingroup$ I am asking about the chromosome number. I ask this because the chromosome numbers are not the same across different organism and I feel there could be a reason for this. I suggest epigenetics because of the need for histones to interact with genomic sequence for modulation of genes. $\endgroup$ – Atajera Jan 28 at 18:50
  • $\begingroup$ The problem here is in attributing purpose to evolution, when it's a series of accidents, some of which survived. There are a number of things that can cause chromosomes to be duplicated. (Colchicine is commonly used in modern plant breeding.) If an organsm has its single chromosome accidentally duplicated, and the offspring survive, that change gets propagated to ensuing generations... $\endgroup$ – jamesqf Jan 28 at 18:59
  • $\begingroup$ @jamesqf Then why do we have different genes on different chromosomes and not duplicates? $\endgroup$ – Atajera Jan 28 at 19:04
  • $\begingroup$ @Atajera If a chromosome were duplicated, for it to stay a duplicate and not diverge, every change would have to happen at the same time to every chromosome. That's not really feasible. $\endgroup$ – Bryan Krause Jan 28 at 19:39

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