Raven Johnson Biology Chapter 12 Answers to Review Questions 1. Syngamy produces a diploid zygote. Meiosis consists of two divisions, one of which is a reduction division.
Mitosis is characterized by one division and no reduction division.
Synaptonemal complexes hold homologous chromosome arms together which facilitates crossing over. They are formed during Prophase I. 4. Four chromatids are present. They are still held together at their common centromeres and at the synaptonemal complex. Microtubules form the spindle but attach to only one face of each centromere at the kinetochore.