Most often the repartition between the sexual chromosomes, X and Y, is even in the spermatozoides. However, in some drosophila populations there is a strong bias for X.
The team of Catherine Montchamp-Moreau (IGGIPOP) at EGCE in collaboration with collegues of the Laboratoire de Biométrie et Biologie Evolutive in Lyon and of the Institut de Biologie du Développement in Marseille looked further. A key gene involved in the transmission of chromosome Y in the male gamets was identified on chromosome X. This work was published in PNAS:
« Rapid evolution of a Y-chromosome heterochromatin protein underlies sex chromosome meiotic drive« , par par Quentin Helleu, Pierre R. Gérard, Raphaëlle Dubruille, David Ogereau, Benjamin Prud’homme, Benjamin Loppin et Catherine Montchamp-Moreau publié dans PNAS le 15 mars 2016. DOI:10.1073/pnas.1519332113.
A brief communication was posted on the web site of l’INEE.