An organism behaves altruistically and the recipient does not reciprocate but has an increased chance of acting in a way that is selfish but also as a byproduct benefits the altruist.
ɐn ˈɔːɹɡənˌɪzəm bᵻhˈeɪvz ˌɔːltɹuːˈɪstɪkli ænd ðə ɹᵻsˈɪpiənt dʌznˌɑːt ɹᵻsˈɪpɹəkˌeɪt bˌʌt hɐz ɐn ɪŋkɹˈiːst tʃˈæns ʌv ˈæktɪŋ ɪn ɐ wˈeɪ ðæt ɪz sˈɛlfɪʃ bˌʌt ˈɔːlsoʊ æz ɐ bˈaɪpɹədˌʌkt bˈɛnɪfˌɪts ðɪ ˈɔːltɹuːˌɪst.