In general, an asexual phase exists where the seaweed's cells are diploid, a sexual phase where the cells are haploid, followed by fusion of the male and female gametes.
ɪn dʒˈɛnɚɹəl, ɐn eɪsˈɛkʃuːəl fˈeɪz ɛɡzˈɪsts wˌɛɹ ðə sˈiːwiːdz sˈɛlz ɑːɹ dˈɪplɔɪd, ɐ sˈɛkʃuːəl fˈeɪz wˌɛɹ ðə sˈɛlz ɑːɹ hˈæplɔɪd, fˈɑːloʊd baɪ fjˈuːʒən ʌvðə mˈeɪl ænd fˈiːmeɪl ɡˈæmiːts.