Chiasma. The cross-shaped exchange configuration between non sister chromatids of homologous chromosomes that is visible during prophase I of meiosis. chiasma The site where the exchange of chromosome segments between homologous chromosomes takes place (crossing-over) (pl.: chiasmata). PICTURE
Vegan diets are based on grains and other seeds, legumes (particularly beans), fruits, vegetables, edible mushrooms, and nuts. Meat analogues (mock meats) based on soybeans (tofu), or wheat-based seitan/gluten, are a common source of plant protein, usually in the form of vegetarian sausage, mince, and veggie burgers.
Within a plant-based diet, there are varying degrees, from a vegan approach (which excludes all animal products, including eggs and dairy) to a vegetarian one (which generally excludes meat, poultry, and fish products but includes eggs and dairy) to more flexible options like a pescetarian diet (which just excludes meat and poultry).