by Public Library of Science Lantern slide of drawings of the male and female body, with grid lines. Made by Alex Gunn & Sons, Melbourne, Victoria, circa 1940s. Credit: Museums Victoria (Public Domain, creativecommons.org/publicdomain/mark/1.0/) Some physical traits that differ between sexes are known to be linked to certain single nucleotide polymorphisms (SNPs) in chromosomes other than...
