PPT-DNA and Chromosomes

What is DNA DNA is where the GENETIC CODE is stored It is a set of instructions for building proteins Sent by the CEO to the WORKERS as instructions for building PROTEINS Who are the workers The RIBOSOMES. EQ:. What is the importance of meiosis in providing genetic variation?. . SPECIALIZED CELLS. You have many specialized cells in your body that can be divided into two groups. . 1. . . SOMATIC. = body cells; make up most of your . and how is it arranged!. Mike . Clark, M.D.. Amount of Genetic Material in a Cell. Before we discuss mitosis or meiosis – let’s examine how much genetic material is in a cell.. There are two divisions of cells in the human body- somatic cells and gametes (sex cells). Description .   . A. Reproduction is characteristic of living things and is essential for the survival of species. . B. Genetic information is passed from generation to generation by DNA; DNA controls the traits of an organism. . (Game from Univ. Utah). Siguna. Mueller. PhD student in BMS, Univ. Wyoming. What is DNA?. Each cell needs instructions for its role in the body. What do these instructions look like?. The instructions come in the form of a molecule called DNA.. Chromosomes carry genes in a linear sequence that is shared by members of a species.. Understandings:. Prokaryotes have one chromosome consisting of a circular DNA molecule. . Some prokaryotes also have plasmids but eukaryotes do not. .. Hayley Siddons. DNA. What is DNA. Deoxyribonucleic Acid. The unit of inheritance for all living organisms. DNA is packaged into Chromosomes in the cell. To make it more compact to fit into the cell . Section 5.2. 1. Objectives. SWBAT describe the structure of a chromosome.. SWBAT follow chromosomes through the processes of mitosis and cytokinesis.. 2. Vocabulary. Chromosome. Histone. Chromatin. Chromatid. diploid. Sex cells (gametes/germ cells) have only one set of chromosomes . . = . haploid. . That means when fertilization . occurs, the new individual will. have the correct number of chromosomes.. DISCLAIMER: • The presentation includes images which are taken from Google images or books . • They are being used in the presentation only for educational purpose . • The author of the presenta 2n 2n Meiosis 2. How many DNA molecules are present in a chromosome of a cell in metaphase of mitosis? How many DNA molecules are present in a chromosome of a cell at metaphase II They are also called as mega chromosomes. . These chromosomes are very long and thick in appearance during metaphase than normal chromosomes.. Hence they are called as Giant chromosomes.. The Giant chromosomes are of two types-. Deoxyribonucleic Acid (DNA). The DNA double helix structure was discovered in 1953 by James Watson and Francis Crick.. The DNA strands are made up of four nucleotides:. Adenine (A). Thymine (T). Guanine (G). Important. Notes. For revision only. Objectives: . Describe the number, structure, and classification of human chromosomes . Explain what a Karyotype is and how it is obtained. . Describe chromosomal banding and explain its use. . Chromatin. - unwound DNA (loose). . Copied. Sister chromatids. - two identical copies of DNA (loose). . Coiled and Connected. Chromosomes. - two coiled, identical copies of DNA connected to each other (tight).