Final answer:
During meiosis II, specifically during Anaphase II, sister chromatids are separated into individual chromosomes, ensuring haploid cells are produced for fertilization.
Step-by-step explanation:
In humans, meiosis is the process through which haploid cells are produced from a diploid cell. This is an essential step for sexual reproduction, allowing for the mixing of genetic material from two parents. During the meiosis II phase, sister chromatids are separated into individual chromosomes. This separation occurs in four primary phases: Prophase II, Metaphase II, Anaphase II, and Telophase II, with Anaphase II being the specific phase where sister chromatids are pulled apart. This crucial step ensures that resulting gametes carry only half the original number of chromosomes, making them haploid, and thus, ready for fertilization with another haploid from the opposite sex.