Hans Winkler
Hans Karl Albert Winkler (23 April 1877 – 22 November 1945) was a German botanist. He was Professor of Botany at the University of Hamburg, and a director of that university's Institute of Botany. Winkler coined the term 'heteroploidy' in 1916. He is remembered for coining the term 'genome' in 1920, by making a portmanteau of the words gene and chromosome. He wrote: 
This may be translated as: "I propose the expression "Genom" for the haploid chromosome set, which, together with the pertinent protoplasm, specifies the material foundations of the species ..."
Sex-limited genes
Unsurprisingly, the idea of sex-limited genes was initially developed by Charles Darwin himself in 1871 in his book "The Descent of Man and Selection in Relation to Sex." He does not distinguish between sex-limited, sex-linked, and sex-influenced genes, but refers to any gene that expresses differently between sexes as sex-limited. While this concept was still in its infancy, Darwin catalyzed the further development of sex-related selection. Thomas Hunt Morgan, fully aware of this confusing terminology, published an article in "The American Naturalist "in 1914 titled "Sex-Linked and Sex-Limited Inheritance." This article directly acknowledges that Darwin applied the term sex-limited whenever a characteristic seemed specific to one sex. Morgan proposes the definitions for sex-linked genes and sex-limited genes that we still use today (and that were defined in the introduction above). This paper helped to distinguish between these two similar concepts and clarify much confusion in the scientific community at the time. Morgan's paper was followed by several others involving sex-limited genes and their expression as traits. One of the more notable examples is John H. Gerould's "Inheritance of White Wing Color, a Sex-Limited (Sex-Controlled) Variation in Yellow Pierid Butterflies," published in "Genetics "in 1923 (and edited slightly in 1924). Gerould observed that in this species of butterfly, females naturally occur as yellow or white, while males only occur with yellow coloration. He extensively explores this apparently sex-limited trait from a genetic perspective in this ground-breaking 50 page paper. To conclude the notable advancements in the early stages of the development of sex-limited genes, a brief discussion of R. A. Fisher is necessary. Commonly hailed as one of the best evolutionary biologists of his time, Fisher was also a talented geneticist. His book "The Genetical Theory of Natural Selection", published in 1930, over 20 years before the double-helix shape of DNA was discovered, was the first attempt to explain Darwin's theories within the foundation of genetics. Chapter 6 of this book is titled "Sexual Reproduction and Sexual Selection" and includes a genetic interpretation of Darwin's initial idea of sex-limited genes. After these groundbreaking works, papers continue to be published further exploring the causes, mechanisms, evolutionary advantages, and more of sex-limited genes.