BIO SCI 93 Chapter Notes - Chapter 13.3: Synaptonemal Complex, Gamete, Fundamental Theorem Of Arithmetic

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 93
• Professor: Michael Clegg

Document Summary

The first division of a two-stage process of cell division in sexually reproducing organisms that results in cells with the number of chromosome sets as the original cell. The stages of meiosis: sister chromatids are two copies of one chromosome, closely associated all along their lengths (sister chromatid cohesion, together the sister chromatids make up one duplicated chromosome. In contrast, two chromosomes of a homologous pair are individual chromosomes that were inherited from different parents. Centrosome movement, spindle formation, nuclear envelope breakdown. Each chromosome pairs with its homolog, aligned gene by gene, and crossing over occurs. Each homologous pair has one or more chiasmata, where crossovers have occurred. Microtubules from one pole or the other will attach to the two kinetochore, one at the centromere of each homolog. The homolog pairs will then move toward the metaphase plate. The dna molecules of non-sister chromatids are broken by proteins and are rejoined to each other.