During telophase I, what form are the chromosomes in?

During telophase I of meiosis, the chromosomes are found in the form of sister chromatids. This phase follows the separation of homologous chromosomes and marks the end of the first meiotic division. Each chromosome, which has already duplicated during the S phase of interphase, consists of two identical sister chromatids joined at the centromere.

As the cell transitions into telophase I, the nuclear envelope begins to reform around each set of separated chromosomes, which are still comprised of sister chromatids. Hence, it is important to note that even though homologous pairs have segregated, the individual chromosomes still consist of two sister chromatids at this stage.

This understanding is crucial for differentiating between the phases of meiosis and the structural organization of chromosomes as they undergo division.