pseudoallele

noun

pseu·​do·​al·​lele ˌsüd-ō-ə-ˈlē(ə)l 

: any of two or more closely linked genes that act usually as if a single member of an allelic pair but occasionally undergo crossing-over and recombination

pseudoallelic

-ˈlē-lik, -ˈlel-ik 

adjective

pseudoallelism

-ˈlē(ə)l-ˌiz-əm, -ˈlel-ˌiz- 

noun