不平等的细胞 germ cell germ-line cells germ-line cells ●+●+ ●+● →●+ germ zygote zygote cell somatic cells somatic cells PARENT OFFSPRING germ cell 生殖细胞突变能遗传 germ-line cells germ-line cells ●→●+● ●→● germ zygote zygote cell 突变 B 体细胞突变不能遗传 somatic cells somatic cells PARENT OFFSPRING Figure 9-4 Essential Cell Biology(Garland Science 2010)Figure 9-4 Essential Cell Biology (© Garland Science 2010) 体细胞突变不能遗传 突变 生殖细胞突变能遗传 不平等的细胞