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Also we see that what are obviously broken genes are carried along for a pretty significant time. It is unlikely that these are both broken genes and of some other value (unless pure bulk is of value).
Could one of the reasons why organisms like humans have more junk dna is because humans have a slower reproductive rate than bacteria so they have fewer generations to sort through the closet and discard unused and unwanted code?
Like if my nerd neighbor cleans his garage every other weekend but I only clean mine in the spring and the end of fall, I will have more junk on hand at any given time? Except for those two times when I clean it and then that is like a quantum jump in the condition of my garage verses his more stable situation.