Regulation of the cell cycle is accomplished in several ways. Meiosis occurs in a relative few cells of a multicellular organism, while mitosis is more common.
Haploid and diploid are terms referring to the number of sets of chromosomes in a cell. The gametophyte phase is "haploid", and is the part of the life cycle in which gametes are produced by mitosis of haploid cells. Metaphase II is similar to mitosis, with spindles moving chromosomes into equatorial area and attaching to the opposite sides of the centromeres in the kinetochore region. The daughter chromosomes arrive at the poles and the spindle fibers that have pulled them apart disappear.
Environmental factors such as changes in temperature and pH, and declining nutrient levels lead to declining cell division rates. The sporophyte phase is "diploid", and is that part of the life cycle in which meiosis occurs. Due to their increased numbers of chromosomes, organelles and complexity, eukaryote cell division is more complicated, although the same processes of replication, segregation, and cytokinesis still occur.
Remember that the process is a dynamic one, not the static process displayed of necessity in a textbook. Beginning of cytokinesis in a plant: The Cell Cycle is the sequence of growth, DNA replication, growth and cell division that all cells go through.
For example, animal life cycles have a dominant diploid phase, with the gametic haploid phase being a relative few cells. Some animal cells may have division of the centrioles during this phase. However, many plant species are thought to arise by polyploidy , and the use of "diploid" in the last sentence was meant to indicate that the greater number of chromosome sets occur in this phase.
This all the cytoplasm and organelles go into the egg.
We think you have liked this presentation. At birth each female carries a lifetime supply of developing oocytes, each of which is in Prophase I.
All else is as in Prophase of mitosis. Most cells are observed in Interphase, the longest part of the cell cycle.
Since the formation of new DNA is an energy draining process, the cell undergoes a second growth and energy acquisition stage, the G2 phase. Each of these prospective germ cells carries half the number of chromosomes of somatic cells. Telophase is when the chromosomes reach the poles of their respective spindles, the nuclear envelope reforms, chromosomes uncoil into chromatin form, and the nucleolus which had disappeared during Prophase reform.