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(A) A diagram of a Parrondo's game (cf. Harmer and Abbott 1999b). Here game 1 represents a neutral genetic background without selection, and winning or losing can be thought of as passing or not passing an allele on to the next generation, in this case 
. Game 2 represents the sexually antagonistic selection that results from the interaction of two alleles, in this case 
and 
. (B) A diagram of the inheritance pattern for the X-linked Ξ- and autosomal Δ-loci.
