Mendelian Heredity
57 objects illustrate this topic:

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"Theory of Ancestral Contributions in Heredity," handwritten manuscript by Karl Pearson, published in Proceedings of the Royal Society (vol. 81:547), multiple pages (#1970)
"The Present Position of the Mendelians and Biometricians," The Mendel Journal, focusing on the "battle" over intermediate forms, multiple pages (#1790)
"The Study of Human Heredity," by Davenport, Laughlin, Weeks, Johnstone, and Goddard, Eugenics Record Office Bulletin No. 2, multiple pages (#1771)
Traits showing dominance in F1 and segregation in F2 (#992)
W. Bateson letter to F. Galton, asking him to read Mendel's "remarkable investigations" and confirming work by Tschermak and de Vries(8/9/1900), multiple pages (#2102)
"White Indians of Panama," 3rd International Eugenics Conference (#1067)
W.P. Heningham letter to E. Nettleship, about inheritance of human disorders and sex determination, with references to Bateson and Garrod (11/28/1904), multiple pages (#2136)