Final answer:
After meiosis I, there are two haploid cells with 10 chromosomes (composed of two sister chromatids) each. After meiosis II, there are four haploid cells, each with 10 single-stranded chromosomes. Sister chromatids only exist after meiosis I since they separate during meiosis II.
Step-by-step explanation:
Chromosome and Sister Chromatid Numbers During Meiosis
If a cell starts with 10 homologue pairs, this means it contains 20 chromosomes, as each pair is made up of two homologous chromosomes. During meiosis I, homologous chromosomes separate, and two haploid cells are formed, each containing one chromosome from each original homologous pair. Therefore, after meiosis I, there are still 20 chromosomes in total, 10 in each of the two daughter cells. However, each chromosome at this stage is still composed of two sister chromatids.
During meiosis II, the sister chromatids separate, and a total of four haploid cells are produced. After meiosis II, each of the four daughter cells contains 10 chromosomes, and at this point, the sister chromatids have been separated, so there are no longer sister chromatids, only individual chromosomes in each cell.
In summary, after meiosis I, there are two cells each with 10 chromosomes (each chromosome having two sister chromatids), and after meiosis II, there are four cells each with 10 single-stranded chromosomes (no sister chromatids).