The term sister chromatid only applies when the identical copies are closely associated with one another and held together by a centromere. When they move apart during anaphase of mitosis or anaphase II of meiosis, the genetic material goes from being sister chromatids to individual chromosomes.
Also, what are sister and non sister chromatids?
Sister chromatid exchange (SCE) is the exchange of genetic information between two sister chromatids. Non-sister chromatids, on the other hand, refers to either of the two chromatids of paired homologous chromosomes, that is, the pairing of a paternal chromosome and a maternal chromosome.
Do sister chromatids have the same DNA sequence?
In contrast, two homologous chromosomes usually do not have identical alleles at all loci. They are inherited from different parents and therefore are not derived from the same DNA molecule. The two chromatids of each sister chromatid pair are segregated into separate cells in both mitosis and meiosis.
What is the structure of sister chromatids?
The two identical chromosomes that result from DNA replication are referred to as sister chromatids. Sister chromatids are held together by proteins at a region of the chromosome called the centromere.