Question 2
In the bead experiment, why must each bead be returned to its bag before the next draw?
The right answer is the one marked above.
So every draw has the same chance as the one before it. If beads are kept out, the bag changes as you go and later draws are no longer equally likely.
A parent plant does not run out of factors when it makes a gamete, so the model has to put the bead back to stay honest to what it is modelling.