When using the turtle function in python, how can I generate a random dot color?

For a my class, I am tasked with programming a turtle function that is user controlled via the arrow keys. The function displays itself and then a mirror of itself with dots. Each dot should be a completely randomized color. So far, I have this:

from turtle import *
from random import randrange

FRAMES_PER_SECOND = 10
mirrorTurtle = Turtle()

def turnRight():
    global turtle
    global mirrorTurtle

    turtle.right(45)

def turnLeft():
    global turtle
    global mirrorTurtle

    turtle.left(45)

def randomColor(turtle):
    r = randrange(256)    # red component of color
    g = randrange(256)    # green component
    b = randrange(256)    # blue component

def move():
    colormode(255)
    global turtle
    global mirrorTurtle
    global moving

    if moving:
        for i in range(1):
            turtle.penup()
            mirrorTurtle.penup()
            turtle.forward(40)
            turtle.dot(20, "red")
            mirrorTurtle.dot(10, "blue")
            turtle.forward(1)
            mirrorTurtle.setpos(-turtle.xcor(), -turtle.ycor())
            ontimer(move, 1000 // FRAMES_PER_SECOND)

def start():
    global moving

    moving = True
    move()

def stop():
    global moving

    moving = False


def main():
    colormode(255)
    global turtle
    global mirrorTurtle

    turtle = Turtle()
    turtle.hideturtle()
    mirrorTurtle.hideturtle()


    onkey(turnRight, "Right")
    onkey(turnLeft, "Left")
    onkey(start, "Up")
    onkey(stop, "Down")
    listen()



if __name__ == "__main__":
    main()

the issue for me is, where I have "red" and "blue" are supposed to be random colors (that still act as a mirror (i.e.; if the first dot typed is blue, the mirror should be blue as well).