Explore the basics of heredity and variation through the lens of early genetics. This book collects the substance of Yale’s Silliman Lectures, presenting how Mendelian methods reveal the units that shape living traits. It frames how genetics helps us understand evolution, species, and the diversity of life with careful analysis rather than broad speculation.

The pages discuss how definite, regular patterns of variation arise, how local forms relate to larger groups, and why simple ideas of adaptation don’t always explain what we see in nature. It also surveys the emergence of the mutation concept and its role in evolution, all grounded in observations from biology and natural history.

Key ideas about unit characters or factors that drive heredity.

How variation is structured and how it informs our view of species and subspecies.

Examples drawn from American natural history to illustrate genetic principles.

Context on the limits and promises of Mendelian reasoning for understanding evolution.

Ideal for readers who want a foundational, thoughtful look at early 20th‑century genetics and its impact on how we study living organisms.

Book Description

These lectures, published at Yale in 1913, illuminate the formation of theories that are central to the modern study of genetics, heredity and evolution. In them, William Bateson (1861-1926) chronicles the conflicting and developing theories on taxonomy, speciation, variation and hybridisation, using a wide taxonomic range of detailed examples.

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