GenEvo 3 Genetic Drift and Natural Selection

GenEvo 3 Genetic Drift and Natural Selection preview image

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My_photo_2 Sugat Dabholkar (Author)

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Part of project 'GenEvo Curriculum'
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breed [ ecolis ecoli ]

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;; SETUP PROCEDURES ;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup   ; Sets up the population of bacteria (E. coli) randomly across the world.
  clear-all
  let color-list [ gray red brown yellow green cyan violet magenta ]

  create-ecolis number-of-traits [
    set shape "ecoli"
    setxy random-xcor random-ycor
    set color first color-list
    set color-list but-first color-list ; each type has a unique color so we remove this color form our list
  ]

  reset-ticks
end 

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;; RUNTIME PROCEDURES ;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to go
  ask ecolis [
    move
    reproduce
    check-if-dead
  ]
  tick
end 

to move  ; E. coli cells move randomly across the world.
  rt random-float 360
  fd 1
end 

to reproduce    ; E. coli cells reproduce based on % selective advantage when Natural-Selection? is ON.

  ifelse natural-selection? [

    ; we have to use `runresult` here in order to compare, for example, the string "magenta" to the primitive `magenta`
    ifelse color = runresult faster-reproducing-ecoli [

      ; When the natural selection is ON, Faster_reproducing E. coli cells
      ; have higher chance of reproduction based on % selective advantage.
      if random-float 100 > ( 99 - ( selective-advantage / 100 ) ) [
        hatch 1 [rt random-float 360 fd 1]
      ]
    ]
    [
      if random-float 100 > 99 [
        hatch 1 [rt random-float 360 fd 1]
      ]
    ]
  ]
  [
    ask ecolis [    ; When natural selection is OFF, all E. coli cells have same chance of reproducing.
      if random-float 100 > 99 [
        hatch 1 [rt random-float 360 fd 1]
      ]
    ]
  ]
end 

to check-if-dead       ;; random chance of death when the total population exceeds carrying capacity
  if random count ecolis > carrying-capacity [
    die
  ]
end 


; Copyright 2016 Uri Wilensky.
; See Info tab for full copyright and license.

There is only one version of this model, created over 2 years ago by Sugat Dabholkar.

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