A couple, Jabari (he/him) and Olivia (she/her) have two sons, Kai (they/them) who is diagnosed with Tay-Sachs and Zion (he/him) who is not. Both Jabari and Olivia do not have Tay-Sachs. According to these data, is Tay-Sachs an autosomal recessive or dominant disorder? Explain your answer. Who among Olivia, Zion, Kai and Jabari is homozygous or heterozygous for the disorder allele?