[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. Prokaryotic Nucleoids. Lampbrush Chromosomes 3. Polytene Chromsomes or Salivary Gland Chromosomes 2. These different types of chromosomes based on the number of centromeres are the following: Acromic chromosome Type # 1. ADVERTISEMENTS: Kinds of Chromosomes: Lampbrush, Polytene and Supernumerary! Study of chromosome structure, morphology, number andtypes - Karyotype and Idiogram . Also known as the monarchial type of chromosomes, they have a centromere that is located towards the end of the chromosome. Many kinds of gene mutations can occur, especially during DNA replication. A chromosome is a structure that occurs within cells and that contains the cell's genetic material. Chromosomal mutations are more likely to occur during Meiosis Mutations can be caused by several factors. Types of Chromosome Mutations Aneuploidy (2n +/- m) Aneuploids differ from wild-type individuals by part of a chromosome set. These chromosomes are very common in the cells that belong to organisms in the animal and vegetable kingdom. Two Types of Mutations Some mutations affect a single gene, while others affect an entire chromosome. 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 According to the number of centromeres. In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure. 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, … They can be seen with naked eye and are characterized by fine lateral loops, arising from the chromomeres, during first prophase […] The types are: 1. Chromosomal Abnormalities PPT and PDF Free To Download: A body abnormality, disorder, anomaly, aberration, or mutation may be a missing, extra, or irregular portion of body desoxyribonucleic acid.It is from an atypical range of chromosomes or a structural abnormality in one or additional chromosomes. Thus, telocentric chromosomes have a ‘rod’ shaped appearance. The amount of centromeres present in the chromosome helps determine the type of chromosome. DNA is the basic unit of Heredity. Nondisjunction is a common mechanism for ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 70611d-NWZlN But the stretch of DNA is so long that it seems impossible to fit it in the tiny nucleus. In some cases, the telomeres extend from both the chromosome ends. Chromosome- Structure, Types and Functions. ADVERTISEMENTS: The following points highlight the three special types of chromosomes. That genetic material, which determines how an organism develops, is a …