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Academic & Professional Books  Evolutionary Biology  Human Evolution

Looking Down the Tree The Evolutionary Biology of Human Origins

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By: Mitchell B Cruzan(Author)
160 pages, 41 illustrations
Looking Down the Tree
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  • Looking Down the Tree ISBN: 9780197805169 Paperback 29 Nov 2025 Available for pre-order
    £25.99
    #267737
  • Looking Down the Tree ISBN: 9780197805152 Hardback 29 Nov 2025 Available for pre-order
    £79.00
    #267736
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About this book

We know much about our history from bones and DNA, but these studies do not tell us about the characteristics that are not preserved in the fossil record – the fleshy parts and behaviours. Evolutionary biologists are more interested in the processes of evolution than the patterns; what caused the changes we see in the fossil record? Looking Down the Tree applies evolutionary principles to understand the history of our species and the pressures of natural selection which led to our unique appearance and behaviours.

Cruzan draws upon evidence from fossils, genomics, phylogenetics, coalescence theory, and the anatomy and physiology of our human ancestors and other animals to arrive at an understanding of the origin of human appearance and behaviour. This evidence is discussed in the context of comparative biology, natural and sexual selection, evolutionary constraints, inbreeding and inclusive fitness, and genetic and cultural evolution.

The story of our past that we piece together provides a novel view of how savanna habitats favoured a unique set of adaptations, including bipedalism and the loss of fur in our early australopithecine ancestors. Other characteristics were outcomes of increasing brain size, which led to the birth of helpless infants that required years of childcare. Cooperation was favoured through inbreeding and inclusive fitness in the clans of our ancestors as they struggled to survive through extensive periods of severe drought in eastern Africa. The book ends this discussion with an evaluation of the increasing importance of cultural evolution, as the transmission of skills and knowledge became ever more important for human life. Like any other species, we are the product of the environments that our ancestors experienced.

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Biography

Mitchell B. Cruzan is Professor of Biology at Portland State University. He received his BA and MA in Biology from California State University, Fullerton, and his PhD from Stony Brook University. He is currently an associate editor for Molecular Ecology, a leading journal in the field. He has previously published an advanced textbook, Evolutionary Biology: A Plant Perspective (OUP, 2018).

Coming Soon
By: Mitchell B Cruzan(Author)
160 pages, 41 illustrations
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