BIOL 1000 Chapter Notes - Chapter 21: Sister Chromatids, Common Wheat, Meiosis
Document Summary
Chapter 21 meiosis: what is meiosis, meiosis is a special type of cell division where one cell divides twice to produce 4 genetically different daughter cells. These cells are the reproductive cells: terms for describing chromosomes, chromosomes, a chromosome is a structure of dna and proteins that contains a cell"s hereditary information, a sex chromosome is one that determines the sex of an organism. However, the alleles of each gene often differ since one chromosome comes from the mother and the other comes from the father. Each chromosome in this pair is called a homolog: non-sister chromatids are chromatids on different chromosomes of the homologous pair. Sister chromatids are held together by a protein called cohesin. They being to partially separate the chromosomes in each bivalent: regions called chiasmata begin to form between non-sister chromatids. This is where exchange of maternal and paternal dna occurs. Each of these cells contain unreplicated dna: genetic variation, asexual vs.
