This is the female parent. They have to produce the xcels because for fertilization to actually take place, we have to have a sperm cell combined with the xcel to reform that diploid number of chromosomes to basically form that zygote. Now, we know from meiosis that during the process of meiosis when we form the gametes we have the law of segregation that is observed and what that means is the chromosomes, the homologous chromosomes actually separate. They segregate during gamete formation. And so, even though this is the genotype of that parent number one, before the mating process takes place, these two chromosomes, these two chromosomes actually have to segregate, separate during the process of meiosis. And so we form these individual gamete cells that contain only one of the pair of homologous chromosomes.