PPT-CHROMOSOME AND CELL DIVISION

CHROMOSOME AND CELL DIVISION Despite the diversity among cells three basic features are common to all cell types All cells have outer boundary an interior substance and a control region CELL STRUCTURE AND FUNCTION. Meiosis. Meiosis occurs in sexual reproduction when a diploid germ cell produces four haploid daughter cells that can mature to become gametes (sperm or egg).. Meiosis. . Goal: reduce genetic material by half. Obectives. Describe the result of meiotic division in terms of sexual reproduction. Discuss the structure of homologous chromosomes. Describe chromosomes in terms of ploidy. Distinguish between sexual and asexual reproduction. A Chromosome and Sister Chromatids. Key Points About Chromosome Structure. A . chromosome consists of DNA that is wrapped around proteins (. histones. ) and condensed. Each . histone. and the DNA wrapped around it make up a . The final cell suspension in 3:1 methanol:acetic acid fixative was then dropped from varying heights: 0 cm, 1 cm, and 30 cm. A ringstand holding a micropipetter was used to set the height of the cell suspension above the slide and the suspension could then be accurately dropped onto the slide from the appropriate height. 12 µl of cell suspension was dropped onto each slide and the slide was allowed to air dry completely. . SUBMITTED BY:. ALABADO, SHEENA ANN C.. LUISTRO, JANELLE. What is a chromosome?. A chromosome is…. A very long DNA molecule and associated proteins that carries portions of the hereditary information of an organism.. Figure 12.1b The functions of cell division: Growth and development. Figure 12.1c The functions of cell division: Tissue renewal. Figure 12.2 Eukaryotic chomosomes. Figure 19.0 Chromatin in a developing salamander ovum. GENOMICS 7 264-269 1990 SUSAN A LEDBETTER MARGARET R WALLAcEt FRANCIS S CoLmst AND DAVID H LEDBETTER institute for Molecular Genetics Baylor College of Medicine Houston Texas 77030 and tHoward Hughes Cell Division . —. . process by which a cell divides into . 2 new cells. Why do cells need to divide? . Living things . grow. by producing . more cells. , NOT because each cell increases in size. Organisms that reproduce sexually are generally diploid: each cell contains two sets of chromosomes—a maternal chromosome set and a paternal chromosome set—one inherited from each parent. . . Google Images. Chromatin – the less tightly coiled DNA-protein complex. Centromere – the region of the chromosome that holds the two sister chromatids together during mitosis.. SEX CHROMOSOMES & AUTOSOMES. Sex chromosomes are chromosomes that determine the sex of an organism, and they may also carry genes for other characteristics. . http://youtu.be/Q6ucKWIIFmg. http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_the_cell_cycle_works.html. Animated Mitosis. Actual Cells Going Through Cell . Division. 1 Cell Cycle is an orderly sequence of events by which a growing cell duplicates its contents and divides into two. The period required to complete one cell cycle is called generation time, e.g., 20 Acknowledgement. I would like to express special thank of gratitude to our respected principal madam, Mrs. . Kuljit. . Kaur. , for giving us this unique opportunity to express ourselves in a creative way. Euploid. Have the . normal. chromosome number. Polyploid. A cell with . extra sets. of chromosomes. Ex: triploid (3n). Aneuploid. Cells missing a single chromosome or having an extra chromosome. Alterations in Chromosome Number.