Grk is a native grapevine variety important for viticulture of the Lumbarda area on the island of Korčula. It is one of the rare grape varieties with functionally female flower, which causes certain difficulties in grape production associated with poor fertilization and the development of the berry. Each cluster of this variety contains small, seedless berries (local name pasoline) and large berries that contain seeds. The share of berries type within the cluster is highly variable. This study attempts to identify the causes of poor seedless berries development trough the analysis of structure and development of male and female gametophyte, to determine the effect of different pollinator varieties on the number of seeded berries in the cluster and to determine the impact of seedless berry share on quality of grapes and wine. Lack of germination pores on pollen sporoderma was found in the analysis. For this reason, the pollen of this variety is sterile, although the development of gametes takes place normally and mature pollen grain contains two sperms and a vegetative nucleus. The structure of the ovule and the presence of individual cells of the female gametophyte in the mature stage were regular. Embryos inside the ovule develop normally through all the developmental stages, otherwise decay of the ovule takes place. The process of the ovule decay begins in unfertilized berries which are 4 mm in size. The decline of ovules caused by two processes: parthenocarpy and stenospermocarpy. Parthenocarpy occurs in berries in which there has been no fertilization. The stenospermocarpy occurs with berries where there has been a process of fertilization but cessation of ovul growth and its degeneration was caused by unknown physiological factors within the plant. In embrio sac of certain berries whose stigmas in the opening flower remained covered with flower cap, there was deternin existence of the zygote in the phase of intensive elongation. Ther was also obvious that both sinergide look identical and non-degenerate, indicating that there was no penetration of the pollen tubes and no proper fertilization proces occured. This fact potentially leads to a hypothesis that in vines can reach process of apomixis. The analysis of the impact of pollinator variety on the number of seeded berries shows that the best pollinators were the following varieties: Pošip (27.68% seeded berries in a cluster) and Plavac mali (26.95% seeded berries in a cluster). The worst pollinator variety was Chardonnay (9.73% seeded berries in a cluster). The analysis of the must quality determined that the large seeded berries contain significantly higher sugar content and pH value while the small seedless berries have significantly higher acid content. A significant difference between varieties of wine made from 80% of small seedless berries in the cluster and those made of 80% of the seeded berries in the cluster was not found in the organoleptic analysis. A significant difference was not determined even in the basic chemical composition of the wine except for ash content in the wine with equal share of large seeded berries and seedless berries. Significantly the largest content of caffeic, coumaric and ferulic acid, procyanidin B1 and resveratrol was found in the wine made from 80% seedless berries.