Prokaryotic Nucleoids. Regulation of Cell Cycle by Checkpoints PPT; Classification of Chromosomes based on Position of Centromere PPT; DNA Repair Mechanisms Part 1: Introduction to DNA Repair PPT; DNA Repair Mechanisms Part 4: Nucleotide Excision Repair of DNA PPT; DNA Repair Mechanisms Part 2: Photoreactivation Repair of DNA PPT The amount of centromeres present in the chromosome helps determine the type of chromosome. They can be seen with naked eye and are characterized by fine lateral loops, arising from the chromomeres, during first prophase [â¦] Type # 1. In some cases, the telomeres extend from both the chromosome ends. According to the number of centromeres. These different types of chromosomes based on the number of centromeres are the following: Acromic chromosome ADVERTISEMENTS: Kinds of Chromosomes: Lampbrush, Polytene and Supernumerary! Free Molecular Biology PPT: Classification of Chromosomes based on Position of Centromere and Length of Chromosomal Arms PPT, Metacentric and Acrocentric Chromosomes Polytene Chromsomes or Salivary Gland Chromosomes: ADVERTISEMENTS: The giant chromosomes were first observed in the cells of salivary glands, gut, ⦠ADVERTISEMENTS: The following points highlight the three special types of chromosomes. These chromosomes are very common in the cells that belong to organisms in the animal and vegetable kingdom. Chromosome- Structure, Types and Functions. [I] Lampbrush chromosomes: These are the largest known chromosomes found in the yolk rich oocytic nuclei of certain vertebrates such as fishes, amphibians, reptiles and birds. The types are: 1. Two Types of Mutations Some mutations affect a single gene, while others affect an entire chromosome. That genetic material, which determines how an organism develops, is a ⦠Study of chromosome structure, morphology, number andtypes - Karyotype and Idiogram . Many kinds of gene mutations can occur, especially during DNA replication. DNA is the basic unit of Heredity. Lampbrush Chromosomes 3. But the stretch of DNA is so long that it seems impossible to fit it in the tiny nucleus. Polytene Chromsomes or Salivary Gland Chromosomes 2. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure. Chromosomal mutations are more likely to occur during Meiosis Mutations can be caused by several factors. Nondisjunction is a common mechanism for ... â A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 70611d-NWZlN A chromosome is a structure that occurs within cells and that contains the cell's genetic material. Thus, telocentric chromosomes have a ârodâ shaped appearance. 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