Books on genetics are on the fourth floor of the library. We organize the books by the Library of Congress Classification System. Genetics books will have call numbers beginning with QH. Here's some detail about Biology book call numbers.
QH 1-278.5 Natural history
QH 301-358 Biology (general)
QH 359-425 Evolution
QH 426-470 Genetics
QH 471-489 Reproduction
QH 501-531 Life
QH 540-549.5 Ecology
QH573-671 Cytology
QH705-705.5 Economic biology