I could help you with the German

I can recommend the book 'Genome' by Matt Ridley. Apart from the fact that this book is an excellent introduction to genetics, it goes about evolution and heredity, human biology, history, psychology, disease, medicine, food, sexuality, instinct, intelligence, personality, behavior. And the book changed the way I think about all this. By the way, here you can find out that chromosome linkage studies seek to identify markers on specific genes within DNA that correspond to one or more specific physical or personality expressions.

Matt has another cool book - 'The Rational Optimist'. In the book, he argues that the key to human progress is trade, and the more open it is, the greater the potential for progress. As a result of the evolution of ideas, mankind will be able to improve its living conditions, despite overpopulation and climate change.