Diagram what would happen if sexual reproduction took place for four generations using diploid (2n) cells.

For each and every reproductive cycle which is shown in the diagram, shows that the type of production which produces polyploids and they are common in plants.

Diploid plus another diploid gamete will lead to tetraploids. These polyploids can further cross with nondisjuct gametes which produces four times plus two times to get hexaploids.
 Species which have even number of chromosomes can often hybridize with other members of their species and genus which have even ploidy numbers.