That organelle is the mitochondria
Neither, humans don't have an estrous cycle, instead the females have a menstrual cycle.
During telophase II, the fourth step of meiosis II, the chromosomes reach opposite poles, cytokinesis occurs, the two cells produced by meiosis I divide to form four haploid daughter cells, and nuclear envelopes (white in the diagram at right) form.
Interphase preps the cell for mitosis; telophase, prophase, and anaphase are all parts of mitosis