Discussion
Sarich and Wilson (1967) demonstrated that human, Gorilla and Chimpanzee were genetically equidistant and distinct for Orangutan and the divergence time is approximately :
Answer: B
Sarich and Wilson estimated the divergence at about 5 million years ago.
Using immunological distances between serum albumins, calibrated against a molecular clock, Sarich and Wilson found humans, chimpanzees and gorillas almost equidistant from one another, with the orangutan more distant. They placed the human-ape split at around 5 million years, far more recent than the 15 to 30 million years then favoured from fossils such as Ramapithecus.
Thirty and ten million years were the older palaeontological estimates their work challenged, and 100 million years is close to the age of the earliest placental mammals.
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