Previous ib exam essay questions: unit 7 use these model essay question responses to prepare for essay questions on your in class tests, as well as the ib examination, paper 3 these questions have appeared on recent ib examinations, exactly as shown below. These protective caps found at chromosomes ends prevent the shortening of genes during dna replication, make it possible for our cells to divide without the erosion of genetic units and ensure that genetic material is successfully passed down from one generation to the next. An essay describing the processes that make up mitosis (cell replication) very good the process of mitosis-----mitosis is the term used to describe cell division for replication the product at the end of mitosis is two daughter cells both genetica.
Chromosome replication precise chromosomal dna replication during s phase of the cell cycle is a crucial factor in the proper maintenance of the genome from generation to 558 words | 3 pages. It was found that the interphase stage of both mitosis and meiosis was the longest of all the stages as this was where most of the 'action' was happening such as cell growth and duplication of all cell organelles and chromosome replication also. During replication, the dna unwinds, as aided by the dna polymerase, and generates two identical dna molecules in the synthesis of protein, the dna also unwinds and synthesizes the messenger rna or mrna.
Replication makes identical copies of chromosomes, whereas genetic exchange, working in the opposite direction, scrambles homologous chromosomes to create new combinations of independently arisen alleles. Chromosome replication - precise chromosomal dna replication during s phase of the cell cycle is a crucial factor in the proper maintenance of the genome from generation to generation. Bi-directional replication within each replicon is initiated at periodic at-rich origins along each chromosome origins are not characterized by any specific nucleotide sequence, but rather the spatial arrangement of origin replication complexes (orcs. 7 because of the grade of condensation of the chromosomes, diakinesis is an ideal phase at which to find the chromosome figure a count the chromosomes in a grasshopper cell at diakinesis record the figure here a does this stand for the diploid figure justify your reply. Essay on dna and homologous chromosomes homologous chromosomes (2n)] [haploid: one single set of genes (n)] meiosis is a process of reduction division in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell.
• chromosomes are condensed, visible with light during cell division (m phase ) special dna sequences exist in each chromosome • replication origins - multiple locations where the replication machinery first binds to. Discussion while chromosome duplication took place prior to meiosis i, no new chromosome replication occurs before meiosis ii in prophase ii the centrioles duplicate this occurs by separation of the two members of the pair, and then the formation of a daughter centriole perpendicular to each original centriole. Telomeres aid in keeping familial stuff within additive chromosomes, forestalling genomic instability in eucaryotes and the loss of utile chromosomes this essay will picture the functions of telomeres in dna reproduction, stableness and cellular aging.
The first thing the dna replication team does is unwind (un-zip) a small section of the old chromosome and pull the two strands apart this process of replication is discussed in chapter 3 of the text essentials of physical anthropology. Exercise 13 mitosis: replication of eukaryotic cells answers to questions 1a mitosis and cytokinesis are often referred to collectively as cellular division. Essay # models for replication of prokaryotic dna: in prokaryotes (bacteria and viruses), the dna is circular hence, replication of dna in these organisms differs from that of eukaryotes, where dna is linear. Meiosis is a process in which a diploid (2n) parent cell is divided into four haploid (n) daughter cells the daughter cells have half the number of chromosomes as the parent cell meiosis mainly occurs in sex cells (gametes) of humans through the process of spermatogenesis (males) or oogenesis (females. Ap biology essay questions the following is a comprehensive list of essay questions that have been asked on past ap exams the questions are organized according to units.
The genetic material of each cell is packaged together in the nucleus as chromosomes and each one of these contains very long dna molecules the human body has 46 chromosomes and in each body cell the chromosomes are in pairs, called homologous and a full set of chromosomes is called the karotype. View essay - essay on chromosome replication from bio_sci 315 at northwestern university it only requires unique sequence clones needed for microarray construction, a way to density label dna and to. Dna replication essay a- dna replication dna replication is a biological process by which a molecule of dna is copied this process starts at the origin of replication where the double helix of the parental dna is being unwound by the helicase in two separated strands.
Asynapsis occurs after chromosomal dna has replicated how many chromatids are involved in crossing-over of a homologous pair of chromosomes b suppose synapsis occurred between two homologous chromosomes, and one had alleles for blue eyes and brown hair and the other had alleles for green eyes and blonde hair. 3) the replication and distribution of dna is manageable because the dna molecules are packaged into chromosomes 4) the nuclei of a human somatic cell (all body cells except the reproductive cells ) each contain 46 chromosomes made up of two sets of 23, one set inherited from each parent. Essay # 4 features of dna replication: a replication is bidirectional: replication of dna molecules begins at one or more unique sites called origin(s) of replication and, except in certain bacteriophage chromosomes and plasmids, proceeds in both directions from the origin.
Essay on the dna replication process - all living things on earth are made up of cells that contain dna deoxyribonucleic acid or dna is the genetic material of living things that can be found in the nucleus of the cells (alcamo, 1996. Mitosis is part of the cell cycle which also includes chromosome replication and division of the cytoplasm ie cytokinesis the chromosomes are always present in the nucleus but they are most easily seen when the nucleus divides. The essential feature of prokaryotic replication biology essay specific to each species, required in the karyon as chromosomes, whereas procaryotic genome are.