表现型

黄色

灰色

黑色

基因型

Aa₁

Aa₂

a₁a₁

a₁a₂

a₂a₂

David King is a Chinese student in France. “I never had cheese or even milk before I came to France. Cows are seldom seen in my part of China. So there is no milk or milk products. I drank some milk when I first arrived in France. I hated it! I tried cheese, too, but I didn't like it. I love ice cream, though that's made from milk.”

Birgit is from Sweden. She traveled to Australia on vocation. "I was in a restaurant that was special in fish. I heard some other people order flake, so I ordered some, too. It was delicious! Later, I learned that flakes is an Australian name for shark. Now, whenever I see a new food, I try it on purpose. You know why? I remember how much I enjoyed flake.”

 Chandra is a dentist in Texas. She is from India. “ I'm afraid to try new foods because maybe there is beef in them. I'm a Hindu(印度教信徒)and my religion(信仰) stops me from eating meat from the cow. That's why I can't eat hamburgers or noodles with meatballs.”

Nathan is from the United States. He taught for a year in China. “My friend gave me some 100-year-old eggs to eat. I didn't like their appearance at all. The eggs were green inside, but my friends said the color was normal. Chinese people put something on fresh eggs. Then they put them in the earth for three months. So the eggs weren't really very old. Even so, I didn't want to touch them.”