表现型是_____________ 与____________ 共同作用的结果。
基因型 环境条件
题目分析：表现型是指具有特定基因型的个体，在一定环境条件下，所表现出来的性状特征的总和．基因型相同的个体，在不同的环境条件下，可以显示出不同的表现型．基因型不同的个体，也可以呈现出同样的表现型．例如，杂合子的高茎豌豆基因型为Dd，纯合子的高茎豌豆基因型为DD，但二者均显示出高茎的表现型．因此表现型是基因型与环境共同作用的结果。
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| One effective way of destroying happiness is to look at something and focus on even the smallest fault. It’s like looking at the tiled (铺瓦的) ceiling and concentrating on the space where one tile is 1 Once I heard a bald man said, “whenever I enter a room 2 I see is hair.” Once you’ve 3 what your missing tile is, explore whether acquiring it will 4 make you happy. Then do one of the three things: get it, replace it with a different 5 , or forget about it and 6 the tiles in your life that are not missing. We all know people who have a relatively 7 life, yet are essentially unhappy while people who have suffered a great deal but 8 remain happy. The first 9 is gratitude. All happy people are 10 . Ungrateful people cannot be happy. We tend to think that being unhappy leads people to 11 , but it’s truer to say that complaining leads to people becoming unhappy. The second secret is 12 that happiness is a byproduct (副产品) of something else. The most obvious 13 are those pursuit (追求) that give our lives purpose - anything 14 studying insects to playing baseball. The more passions we have, the more happiness we are 15 to experience. Finally, the belief that something permanent goes beyond us and that our 16 has some larger meaning can help us to feel happier. We 17 a spiritual faith, or a philosophy, it should 18 this truth: if you choose to find the 19 in every situation, you will be blessed, and if you choose to find the awful, you will be cursed. As with happiness itself, this is 20 your decision to make. | ||||
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