During telophase I of meiosis, which event most accurately describes what occurs in a typical animal cell?

• A. Homologous chromosomes pair (synapsis) and crossing over occurs between non-sister chromatids.
• B. Chromosomes align individually at the metaphase plate with sister chromatids attached to opposite spindle poles (bi-orientation).
• C. Sister chromatids separate at the centromeres and move to opposite poles, producing four haploid nuclei.
• D. Homologous chromosomes arrive at opposite poles and nuclear envelopes may reform around each haploid set, while sister chromatids remain joined.

Answer: (D)