A Study of the Relation of the Behavior of the Chromatin to Development and Heredity in Teleost Hybrids

A Study Of The Relation Of The Behavior Of The Chromatin To Development And Heredity In Teleost Hybrids by Edith Pinney presents a 1918 doctoral dissertation that examines how chromatin behaves during early development in teleost fish hybrids and how this relates to heredity. The work, originally published as a Bryn Mawr College dissertation and subsequently reprinted from the Journal of Morphology (volume 31, number 2, 1918), investigates chromosomal dynamics across several heterogeneous crosses, including Fundulus, Ctenolabrus, Stenotomus, and Menidia species. Through meticulous cytological observations—with fixed material prepared by Bouin’s and other fixatives, stained in Heidenhain’s iron-haematoxylin, and sectioned at five to six microns—Pinney documents chromatin morphology, lagging, elimination, and fragmentation events during various mitotic stages. The study emphasizes that maternal cytoplasmic factors influence the participation of paternal chromosomes in mitosis and that normal chromosomal behavior does not always predict normal development. A general discussion ties together cytoplasmic effects, chromatin interactions, and the variable specificity of cytoplasmic influence on hybridization outcomes, contributing to early understandings of developmental cytology in fish hybrids.