PPT-Griffith’s experiments showed that hereditary material can pass from one bacterial cell

Frederick Griffith 1928 In 1928 Griffith was studying a bacterium called Streptococcus pneumoniae He was trying to develop a vaccine against a virulent strain of the bacterium Virulent . Genetic recombination. Genetic variability – ESSENTIAL!!!. Survival of the species. Diploid Eukaryotes. Crossing over. Meiosis . Haploid Prokaryotes. Transduction. T. ransformation. Conjugation. Transduction. Viruses. They lack a cell membrane. Don’t have a nucleus. Don’t have organelles. They have a variety of shapes. They are too small to be seen unless you use the electron microscope. How do they multiply. Viruses. They lack a cell membrane. Don’t have a nucleus. Don’t have organelles. They have a variety of shapes. They are too small to be seen unless you use the electron microscope. How do they multiply. Introduction and brief history . B y Dr. . Sawsan. . Sajid. Al-. Jubori. . References :. 1-Essential of molecular biology by George M. . Malacinski. 4. th. edition. 2-. Second references: Molecular biology (principles and practice). Phenotypic and genotypic Variability of Bacteria. Overview . Phenotypic variation :. . phenotype : The physical expression of various characters by bacterial cells in a given environment. . These properties are determined by its genome and by environment. . College of Fisheries, . Kishjanganj. BASU, . Patna. Microbial Genetics. Microbial Genetics. Glossary:. Strain . or clone. :. A clone is a population of cells that are genetically . ideal pure culture.. Lec.No.2 Dr. . Oruba. Cellular Organelles: .  . 1- . Ribosomes. ; . These are 18 nm. particles, which are scattered in thousands of them in the cytoplasm. Each particle (unit) is of 70S type, which consists of two subunits; large one of 50S, and a small one of 30S. The concentration of Mg. I. Remind ourselves with the Structure And the Functions Of The Genetic Material. Nucleic acids structure . There are two major classes:. Deoxyribonucleic acid (DNA) . : The most common macromolecule that encodes genetic information. . How are Prokaryotes Different from Eukaryotes?. The way their DNA is packaged. No nucleus. Not wrapped around . histones. The makeup of their cell wall. Bacteria- peptidoglycan. Archae- tough and made of other chemicals, distinct to them. Dr.Qurat-Ul-Ain. Department Of Microbiology. KEMU,Lahore. . Two Basic Types of Cells. _____________________. ______________. Size of Living Things. 1 m = 100 cm = 1,000mm = 1,000,000 . µ. m = 1,000,000,000nm. and brief history . References :. 1-Essential of molecular biology by George M. . Malacinski. 4. th. edition. 2-Second references: Molecular biology (principles and practice). . first . lecture . /. 10. /. 2019 Dr. . oruba. Khalid . abbas. . . Lec. . : 2. . Welcome To. Meet the Microbes!. Coccus. Bacillus. Vibrio. Spirillum. . Mycoplasma. INTRODUCTION. In 1865, Mendel showed that genes transmitted genetic information and in the first part of the 20. th. century, their patterns of transmission were studied extensively.. Although these classical genetic studies provided little insight into the molecular nature of genes, they did demonstrate that the genetic material must perform three essential functions: . For growth and repair. To get food, water, and waste in and out of our bodies quickly. What is the Cell Cycle?. Series of events that take place from one cell division to the next. Constantly repeated.