Mendelian Heredity
57 objects illustrate this topic:

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Manuscript of the "Eugenic College of Kantsaywhere," by Francis Galton (title page and page with a definition of "genetic"), multiple pages (#2104)
"Materials for race improvement," page from C. Davenport's notebook (#492)
"Mathematical Darwinism, A Discussion of the Genetical Theory of Natural Selection," by J.B.S. Haldane, Eugenics Review (vol 23:1), multiple pages (#1820)
"Mendelian inheritance of eye color in man" (#986)
Models of inheritance of racing capacity in horses by Harry H. Laughlin (#1653)
"Multiple neurofibromatosis and its inheritance," by S. A. Preiser and C. B. Davenport, Eugenics Record Office, multiple pages (#595)
Pedigree and photo of polydactyly, by Morris Steggerda, multiple pages (#885)
Pedigree exhibit: "The manner of inheritance of recessive trait. Actual pedigrees of albinism," 3rd International Eugenics Conference (#1081)
"Pedigree of family with color blindness. (Sex limited)." (#1010)
People (April 1931) news items: disputed quote by President Herbert Hoover, Senate tesitmony on birth control, use of eye color inheritance in courts, multiple pages (#1614)
"Probably Mendelian" and "Clearly Hereditary" traits (#994)