sex factor

noun Genetics.
  1. a sex-determining chromosome or gene.
  2. Also called F factor, fertility factor. a plasmid in certain bacteria that enables transfer of genetic material from a donor cell to a recipient by conjugation, resulting in recombination.
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British Dictionary definitions for f-factor

F-factor

noun
  1. informal the quality of being attractive to members of the opposite sex

Word Origin for F-factor

C20: from fanciability factor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012