BIOL 112 Lecture Notes - Lecture 1: Cytokinesis, Cyclin E, Macrophage

• School: McGill University
• Department: Biology
• Course: BIOL 112
• Professor: Joseph Dent

Document Summary

To divide, cells devote a lot of resources to segregating their chromosomes. Looks like spaghetti normally, forms the x-shape when readying for division. The number of chromosomes is characteristic of species of organism. In euk, chromosomes typically come in nearly identical pairs (homologs) Just before cell division, each chromosome has been replicated once to produce 2 chromatids (2 chromatids makes one mitotic chromsome (the x- shape thing)) Mitotic squash of cell readying to divide, stain with a dye, take pic and then line up according to banding pattern. In a karyotype, there are 23 pairs of x-shapes, Each x is 2 pieces of dna (2 chromatids (chromosome + histones)) bound by centromere = mitotic chromosome. Orgs need at least one of each chromosome. Mitosis (m)= somatic cells that make identical clones of themselves a. Create daughter cells that inherit one copy of each chromosome.