ɪf ðə mˈʌðɚz ɐlˈiːl ɪz mˈɪsɪŋ ænd ðə tʃˈaɪld hɐz tˈuː kˈɑːpɪz ʌvðə fˈɑːðɚz mjˈuːtənt ɐlˈiːl, dɪzˈiːz kæn əkˈɜː.
If the mother's allele is missing and the child has two copies of the father's mutant allele, disease can occur.