Now, a true breeding red plant means both of those alleles code for that red color, while a true breeding white plant means both of those alleles found on the pair of homologous chromosomes code for that white color. Now, when we actually cross these two individuals, all the offsprings that are produced will be heterozygous. And we can see that based on the Punnett square here. So this true breeding red plant will produce only one type of sex cell, only one type of gamete, namely the Cr, where the C stands for color and R stands for the red color. So we have two of these slots which basically describe the same type of gamete that is produced by this particular true breeding red plan. And likewise, these are the two gametes that are produced by the true breeding white plan.