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1.肤色由什么决定? 人的肤色通常分为黑、黄、红、白四种。它是由遗传物质DNA决定的。影响肤色的遗传因素有三种:皮肤厚度、血液供给和色素。其中色素最重要,它是形成皮肤色泽的有色物质,特别是黑色素更为重要。产生黑色素的细胞位于皮肤的内外层之间,所有的人都拥有数目大至相同的这种特异细胞,只是在黑色人种中这种细胞的功能更活跃,因而产生更多的黑色素,表现为黑肤色。而其它人种是由其产生
1. What is the color of the skin? People’s color is usually divided into black, yellow, red and white four. It is determined by the genetic material DNA. There are three genetic determinants of skin tone: skin thickness, blood supply, and pigment. The most important of which pigment, which is the formation of the skin color of the colored material, especially melanin is more important. The cells that produce melanin are located between the inner and outer layers of the skin, and all possess the same number of such specific cells, except that in black populations the cells are more active and thus produce more melanin, Black color. And other race is produced by it