Ở bắp, hạt đỏ trội so với hạt trắng. Có hai cây bắp tự thụ phấn, một cây có KG Aa, một cây có KG aa. Mỗi cây tạo được 2 trái, mỗi trái trung bình có 200 hạt. Tính chung khi thu hoạch có bao nhiêu hạt đỏ và bao nhiêu hạt trắng?
Cây aa tự thụ chỉ sinh ra aa.
Cây Aa tự thụ cho 1AA  2Aa  1aa 
kq 500 trắng 300 đỏ 

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