Most gourds that I am familiar with are from a different genus - Lagenaria. In that case they will not cross with each other. Some decorative gourds are in the genus Cucurbita and will cross. The result may then not be very edible if the gourd dominates. You will get a mixture. If they are edible, it would be when the fruit are very small.
As spaghetti squash is a Cucurbita pepo and a banana squash is a Cucurbita maxima, they will not cross. Only cucurbits within the same species will cross-pollinate so you can grow one of each. Incidentally, the fruit of crossed species is still edible, but often inferior.
Squash cross pollination happens when pollen from one squash plant is transferred to the female flower of another plant. This can occur naturally through insects or wind. Cross pollination can affect the quality and yield of the crop by leading to hybridization, which may result in changes in flavor, texture, or appearance of the squash. It can also reduce the yield if the resulting hybrid seeds are planted, as they may not produce the desired characteristics.
Cross-pollinated squash varieties are developed by intentionally breeding different types of squash plants to create new hybrids with desired characteristics and traits. This process involves carefully selecting parent plants with specific traits, such as disease resistance or improved flavor, and then allowing them to cross-pollinate naturally or through controlled pollination methods. The resulting hybrid squash plants inherit a combination of traits from both parent plants, leading to enhanced characteristics in the new variety.
In cross pollination there is wastage of pollen grains , but in self pollination there is no wastage of pollen grains.
The process of pollination from same flower is called self-pollination. the process of pollination from another flower of same breed is called cross-pollination.
cross and self pollination
Cross pollination only occurs between members of the same species. Therefore cross pollination can occur between pumpkins, squash and gourds, but not with cucumbers and pumpkins. It is a myth that cucumbers will make your pumpkins taste "off." Usually a change in flavor is due to soil or water conditions.
The two main types of pollination are self (or autogamous) pollination and cross (or heterogamous) pollination. Self pollination - is when pollination is tansfer from the anther to the stigma of the same flower. Cross pollintion - is when pollination is transfer from the anther to the stigma of another flower
Cross-pollination increases variation within a plant species by introducing new genetic material from multiple individuals. This leads to increased genetic diversity and the potential for beneficial traits to emerge through recombination.
You can create a hybrid between two species through their cross pollination, but that is not new species.
To create more genetic variability so as give momentum to the process of evolution.
self-pollination cross-pollination wind-pollination