developmental process involved in reproduction development of secondary sexual characteristics http://purl.obolibrary.org/obo/GO_0045136 https://www.wikidata.org/wiki/Q14905385 The process whose specific outcome is the progression of the secondary sexual characteristics over time, from their formation to the mature structures. In humans, these include growth of axillary, chest, and pubic hair, voice changes, testicular/penile enlargement, breast development and menstrual periods. Development occurs in response to sex hormone secretion. secondary sex characteristic