By Jack Guy, CNN
Photo: CNN/SUPPLIED
Researchers from the University of Cambridge in England analysed the proportion of full siblings versus half-siblings across several animal species, as well as various human populations throughout history.
Species and societies that are more monogamous tend to have a greater number of siblings that share both parents, while those that are polygamous or promiscuous produce more half-siblings.
The team of scientists led by Mark Dyble, an evolutionary anthropologist at the University of Cambridge, used a computational
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