Causes of ALS. ALS is a somewhat diverse and decidedly mystifying disease. In more than nine out of every 10 cases diagnosed, no clear identifying cause of the disease is apparent, that is, patients lack an obvious genetic history, complete with affected family members.
1 Aristocrat - this variety features a waxy skin and is medium green in color. 2  Black Zucchini - very dark green skin and almost white flesh, very common variety of zucchini.  Zucchini Gadzukes - dark green with distinctive light green ridges, resembles a star when sliced crosswise, compact plant.
Zucchini and yellow squash are the most prevalent summer squashes and look and taste very similar. Squashes generally refer to four species of the genus Cucurbita while Zucchini belongs to one of these four geneses, Cucurbita pepo. Therefore, Zucchini is a Summer Squash. Squash, has its ancestry in the Americas.