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Could someone please explain the meaning of the statement given by TH Morgan:

"genes are linearly arranged on chromosomes"

Since according to my knowledge there are noncoding parts in between.

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This combines two important findings to which Morgan's lab contributed.

  • Genes on the chromosome: They could show that mutated phenotypes were linked to the physical entity of chromosomes.
  • Arranged linearly: They could show that there are distances between different phenotypes correlated to a specific linear arrangement. These distances correspond to the physical distance on these chromosomes (and thus how frequently they are co-inherited). More specifically they showed that distances suggest that the space is linear, e.g.: in ---A--B-------C-D- , A would be commonly inherited with B, but less so with C, and even less with D ... ; Theoretically one could have also thought that the chromosomes are circular (as they indeed are in some bacteria) or adopt an even more complex shape, e.g.: some net-like meshwork on which mutated phenotypes / genes sit. In these other cases one would anticipate more complex patterns of co-inheritance among all pairs of genes relative to a linear arrangement.
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    $\begingroup$ This is a very good answer and I'd like to upvote it, but it doesn't have references. Please help by adding them. :) $\endgroup$
    – Adhish
    Sep 17, 2020 at 9:23
  • $\begingroup$ @David I wasn't the one who posted this question! $\endgroup$
    – Adhish
    Sep 17, 2020 at 13:20
  • $\begingroup$ @Adhish Whoops. Sorry. $\endgroup$
    – David
    Sep 17, 2020 at 13:33

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