Mating TIGERS !!!

Today in class we did an activity in which we pretend tigers are mating randomly in a dark forest. We put different color beads in two different paper bags and have on color represent the dominant gene and the other represent the recessive gene, and in our specific lab having both genes as recessive will cause the organism to die because of a disease. Slowly, we take out most of the recessive gene, but then we realize that there will always be 1 recessive gene in the pool of tigers in the end. Then if these group of tigers go mate with other tigers from other places that probably has the same recessive gene, then the recessive gene will reproduce again.