This chromosome has two chromatids, joined at the centromere. what process led to the formation

this chromosome has two chromatids, joined at the centromere. what process led to the formation of the two chromatids?the nucleus contains a chromosome. the chromosome has two chromatids, joined at the centromere.this chromosome has two chromatids, joined at the centromere. what process led to the formation of the two chromatids?the two chromatids were formed by duplication of a chromosome.the two chromatids were formed by fertilization, bringing together maternal and paternal chromatids.the two chromatids were formed by synapsis and the formation of a synaptonemal complex.