The frequency dependence of mating success in Drosophila melanogaster

In several competition experiments between various strains of Drosophila melanogaster, a rare female advantage as well as a rare male advantage has been observed. This phenomenon was detected by the use of a method described earlier (Lichtenberger et al., Behav. Genet. 17: 203–210, 1987). Often, the use of less refined indices does not lead to the same conclusion.This paper is dedicated to the memory of Dr Marcel Lichtenberger, M.D., fifteen years medical missionary in China, and seventeen years Professor of Human Genetics in the State University of Saigon, Vietnam.     

Patterns of Gustatory Recovery in Patients Affected by the COVID-19 Outbreak

Coronavirus disease 2019 (COVID-19) is a viral infection caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). From March 2020, several studies indicate that many subjects affected by mild-to-moderate COVID-19 presented olfactory/gustatory dysfunction (OD/GD) that appeared strongly correlated between them but not with the other symptoms suggestive of upper airway infectionIn order to evaluate patterns of gustatoy recovery, data from patients with confirmed COVID-19 were collected prospectively from 4 University Hospitals. At this relatively early point in the pandemic, the authors considered that subjective patterns of recovery of olfactory disfunction in COVID-19 patients are valuable for our patients, for hypothesis generation and treatment development.     

Rare male advantage and sex ratio

Relative success of mutant white and wild-type CS Drosophila melanogaster males is frequency-dependent, if sex ratio is 1:1. If the number of females is constant, this success depends on the ratio between the mutant and wild-type males. The sex ratio changes strongly affect the male mating activity of both genotypes.Emphasis is placed on the general interest of the Ayala equation and the Wattiaux-Lichtenberger equation in frequency-dependence and sex ratio dependence analysis.