Mitosis and Meiosis

Label Time Label the following parts on the cell: centrioles, spindles, chromosomes, nucleus chromosomes centrioles spindles nucleus Put each statement in the category of the process it describes Mitosis results in 2 identical daughter cells used for growth, repair, and regeneration goes through PMAT once results in maintenance of chromosomes (diploid) Meiosis results in 4 cells used for sexual reproduction goes through PMAT twice results in a reduction of chromosomes (haploid) separates homologous chromosomes Mitosis Match Match each stage of cell division to what is happening at the time Prophase the chromatin condenses into chromosomes and the nuclear envelope dissolves Interphase the cell grows, performs normal activity, and copies its DNA *most of its life Metaphase spindle fibers attach to centromeres and pull the newly formed chromosomes to line up in the center of the cell Anaphase spindle fibers separate the sister chromatids and pull them towards opposite poles of the cell Cytokinesis the cell splits in two, forming two identical daughter cells Telophase Two nuclear membranes reform and the chromosomes relax Put the Phases of Mitosis in the correct order D, E, B, A,C C, E, B, D, A E, D, A, B, C A, B, C,D,E Concept Check! If a 1 cell divides 4 times in mitosis how many total cells are there at the end? Fill in the blanks! use the word bank at the bottom to help you Mitosis is a truly wonderful process and here is what happens throughout all of the phases. Chromatin (the relaxed form of DNA), is copied so that each cell will have it's own DNA copy after splitting. It then winds up into chromosomes as the nuclear membrane dissolves. These chromosomes are moved to the middle of the cell by spindle fibers attached to their centromere. The spindle fibers pull the chromosomes to opposite sides of a cell where they will unwind and have a new nucleus formed around them as the cell finally splits. MeiosisComplete the Fill in the blanks for Meiosis. Use the word bank to help you Cells that begin meiosis are diploid because they have the full number of chromosomes. These cells have pairs of chromosomes. These pairs are called homologous pairs. One comes from the egg (mother) and the other comes from the sperm (father). These chromosomes are identical. They have information for the same genes but the information may be different because the information is coming from two different people. By the end of the meiosis, the cells that are produced have the haploid number of chromosomes. Mitosis and MeiosisHaploid Vs. Diploid Determine the Number of Haploid and Diploid Chromosomes in the following organisms Cell Type Total Number of chromosomes Number in Body cells Number in sex cells Human 46 46 23 Bacteria 4 4 2 Cat 30 30 15 Pineapple 50 50 25 This is the name for matching pairs of chromosomes partner chromosomes homologous chromosomes twinsies centromeres This is the name of the twist in the pipe cleaners that held together the 2 chromatids centromere chromosomes spindle fibre DNA This results in Genetic Variation by which bits and pieces of genes are exchanged between chromosomes from mom and dad. Mutations Crossing Over Metaphase 1 Swapping Meiosis goes through how many divisions? 1 4 2 8 Meiosis starts off with _cells and creates_cells. 4 and 2 haploid, diploid diploid, haploid egg, sperm Meiosis 2 is very similar to what other process? fertilization mitosis gametes reproduction