PLS 170C1 Lecture Notes - Lecture 10: Dna Replication, Cytokinesis, Tangled
30 Jan 2017
School
Department
Course
Professor
Document Summary
Plant growth occurs in 3 steps: 1. Meristems are clusters of cells that divide by mitosis (& cytokinesis) to create new cells for growth of the plant body. The cell cycle: the cell"s life history from formation (by parent cell division) to its own division that produces two new cells. Interphase dominates the cycle & consists of: g1 : cell growth, s : dna replication, g2: cell growth. M phase: meristems divide by mitosis [meiosis: reproductive organs] & cytokinesis. Nucleotides grouped into genes on the chromosome store information needed for plant growth and development. Mitosis produces exact copies of these genes - dna molecules. Dna is housed in the nucleus as a tangled mess and must be condensed with special proteins to form chromosomes that help organize during cell division. Dna molecules replicate during the s phase of the cell cycle. As mitosis begins, each chromosome consists of duplicate, condensed dna molecules ( sister chromatids ).
