Winnowing was used for

1
Crop Mimicry
Winnowing was used for many generations to
separate the grain from the weed seeds and
chaff. Thus weed seeds were under selection for
traits that mimic the crop.
2
Common Vetch (Vicia sativa) Growing in lentil
field
Lentil crop (Lens culinaris)
Common Vetch (Vicia sativa)
Single recessive mutation
3
Barnyard-grass (Echinochloa crus-galli) Growing
with rice under hand weeding
Barnyard-grass (Echinochloa crus-galli)
Cultivated Rice (Oryza sativa)