Orangutans and human origins
Evolutionary Evidence Origin of the Theory Points of View
Dr. Jeffrey Schwartz, originator of the orangutan theory of human origins. Department of Anthropology, University of Pittsburgh. USA.
Humans have a larger number of features that are uniquely shared with orangutans than with any other living ape. Schwartz (1984) proposed that humans are more closely related to orangutans than to chimpanzees - a model that contradicts the greater genetic similarity of base pair sequences in humans and chimpanzees.
The view presented here is that genetic similarity of base pair sequences is not a necessary measure of phylogenetic relationship and that morphology continues to exist as an independently reliable source of information on evolutionary relationships. The orangutan model presents a conundrum for biological systematics over how to chose between morphological and genetic evidence when they are in conflict.
I exclude one possibility, that there has been any comprehensive comparison of nuclear DNA sequences:
"a model that contradicts the greater genetic similarity of base pair sequences in humans and chimpanzees."
The human genome projects sequenced (mostly) single samples of each chromosomes, and one of those projects used (mostly) the samples from a single individual. There hasn't been a comprehensive chimp genome project. Bands on chromosomes are somewhat similar on chimps and humans, with the chimps (and gorillas, orangutans, and gibbons) having 24 chromosome pairs.