While on the subject, let me give you an example of squash varieties crossing. One year I planted both Hubbard and Banana squash. Both in the same species. At end of season I saved some seed from a Hubbard. The following year I again planted Hubbard and Banana, but I also planted some of the saved seed from the Hubbard.
Here is a picture of what I got. As expected, Hubbard from the true Hubbard seed, Banana from the true Banana seed, and a hybrid fruit from the seed I had saved, which obviously was a cross between the two varieties I had grown.
The hybrid fruit is the one in the middle. You can see it has some characteristics of both parents. This ,by the way, was a delightful eating squash. Its flavor and texture both excellent.
Gardening at 5000 feet elevation, zone 4/5 Northern Utah, Frost free from May 25 to September 8 +/-