This is the book of the generations of Adam. When God created man, he made him in the likeness of God. 2 Male and female he created them, and he blessed them and named them Man when they were created. 3 When Adam had lived 130 years, he fathered a son in his own likeness, after his image, and named him Seth.
In the image and likeness of Adam, all subsequent generations would be fathered, containing a remnant of what it meant to be made for God's glory combined with a penchant to pursue self-interest.