This native from Nicaragua, Peru and Brazil eats sleeps and gives birth on trees. It can’t run or stand straight and will take about a month to move a distance of 1.6 kilometer. And all these because of its feet! With only three toes, they are more suitable for hanging to trees. Can you imagine if there is more than one sloth in a family?
InterphaseThe cell appears a non-dividing cell. The chromosomes appear as threadlike structures. Prophase
Chromosomes become visible as they contract, and shrink. Centrioles appear at opposite sides of the nucleus. Spindle fibres start to form. The chromosomes become shorter and fatter. It consists of 2 chromatids joined at the centromere. Nucleolus disappear. Prophase ends with the breakdown of nuclear membrane. Metaphase
Chromosomes arrange themselves on the equator of the spindle. Anaphase
Chromatids separate at the centromere and migrate to opposite poles of the cell, the centromeres leading. Telophase
Chromosomes reach their destination. The cell starts to constrict across the middle. Nuclear membrane and nucleolus are reformed in each daughter cell. The spindle disappears. Chromosomes eventually regain their threadlike form and the cells return to resting condition (interphase).The daughter cells have the same chromosome constitution as the original parent cell.
Who hasn't heard of the 'Big Bad Wolf 'which poses as Red Riding Hood's grandmother or 'Big Mac', the latter being one of McDonald's signature products. It probably does not need a big lettuce to make the Big Mac, and if it does, there probably would not be a price hike!
InterphaseCell in normal non-dividing condition has chromosomes which are long and threadlike. Early prophase I
Chromosomes contract, becoming short and fat and visible. Nucleolus shrinks. Late prophase I Each chromosome seen to consist of a pair of chromatids. Pairing of homologous chromosomes occurs (synapsis) Metaphase I Homologouschromosomesarrange themselves on equator of spindle Anaphase IHomologous chromosomes separate from each other and migrate to opposite poles of the cell. Telophase I The chromosomes have reached their destination and the cell constricts across the middle as in mitosis. Nucleolus and nuclear membrane for each group of chromosomes reappears Prophase IIThe two daughter cells prepare for the second meiotic division: centrioles have replicated and a new spindle is formed. Metaphase II Chromosomes arrange themselves at equator of the spindle. Anaphase II Chromatids separate at the centromere migrate to opposite poles of the cell. Telophase IICell constricts across the…