AP PSYCHOLOGY

Detailed explanation-1: -All human beings are 99.9 percent identical in their genetic makeup. Differences in the remaining 0.1 percent hold important clues about the causes of diseases.

Detailed explanation-2: -The African origin of modern humans The genetic similarities seen in contemporary populations are the result of gene flow between these populations, as well as natural selection for similar adaptive traits.

Detailed explanation-3: -All humans belong to the same species (Homo sapiens, meaning ‘wise human’). Technically, this implies we can exchange our genes with each another. Biologically, it means any two humans are essentially the same. Our closest relatives–chimpanzees, gorillas and orangutans–are also unusual in the same way we are.

Detailed explanation-4: -The chimpanzee and bonobo are humans’ closest living relatives. These three species look alike in many ways, both in body and behavior. But for a clear understanding of how closely they are related, scientists compare their DNA, an essential molecule that’s the instruction manual for building each species.