PPT-13.1. Considering the Chromosomes

A Karyotypes C Down Syndrome 1 Down syndrome is most common autosomal trisomy involves chromosome 21 2 Most often Down syndrome is due to nondisjunction during gametogenesis a In 23 of cases the sperm had the extra chromosome 21. CELL DIVISION. TOPIC . 2 - 2015. CHROMOSOMES . & CELL DIVISION. Things to cover. Chromosomes. Karyotypes. inc. . chromosomal. . disorders. Cell. division:. Mitosis. Meiosis. & fertilisation. Chromosome theory of inheritance. Genes located on chromosomes = gene locus. Thomas Hunt Morgan, Columbia Univ. “Fly room”. Drosophila. 100s of offspring. 2n = 8. 3 . prs. autosomes. X and Y sex chromosomes. Essential idea: Chromosomes carry genes in a linear sequence that is shared by members of a species.. The . asian. rice (. Oryza. sativa. ) genome can be seen illustrated . above. . Rice possesses up 63,000 genes divided up between 12 chromosomes. Karyotypes. To find what makes us uniquely human, we have to explore the human genome. . A . genome. is the full set of genetic information that an organism carries in its DNA.. A study of any genome starts with chromosomes, the bundles of DNA and protein found in the nuclei of eukaryotic cells. . 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. .. Chromosomes carry genetic information. Chromosomes are wound up DNA. Diploid – Every body cell has 2 sets of chromosomes . n = number of chromosomes. Normal body cells have 2n (2 x n) chromosomes. La gamme de thé MORPHEE vise toute générations recherchant le sommeil paisible tant désiré et non procuré par tout types de médicaments. Essentiellement composé de feuille de morphine, ce thé vous assurera d’un rétablissement digne d’un voyage sur . Chromosomes carry genetic information. Chromosomes are wound up DNA. Diploid – Every body cell has 2 sets of chromosomes . n = number of chromosomes. Normal body cells have 2n (2 x n) chromosomes. Human Genes and Chromosomes. Chromosomes 21 and 22 are the smallest human autosomes. Chromosome 22 has about 43 million DNA base pairs. Chromosome 21 has about 32 million base pairs. . Chromosome 22 has about 545 different genes. Genetic disorders tat occur on chromosome 22 are leukemia and neurofibromatosis (a tumor causing disease). There is also a long stretch of repeating DNA that does not code for proteins. . Human Inheritance. Disorders caused by individual genes - dominant. Individuals with the disorder only need 1 allele to have the disorder. Huntington’s Disease. Caused by a repeat of the sequence CAG . Chromosomal Disorders. Chromosome abnormalities occur as a result of chromosome . mutations. brought on by . mutagens. (like radiation) or problems that occur during cell division.. . The defects are classified as abnormalities of . They are complexes of DNA and proteins. The genome comprises all the genetic material that an organism possesses. In bacteria, it is typically a single circular chromosome. In eukaryotes, it refers to one complete set of . Ms. Diana and Ms. Su’ad. Karyotype Studies. The study of genetic material does not only involve the study of genes. It also involves whole chromosomes by using images of chromosomes stained during metaphase. . 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