CHROMOSOMAL MUTATIONS Výukový materiál GE 02 - 59 Tvůrce: Mgr. Šárka Vopěnková Tvůrce anglické verze: ThMgr. Ing. Jiří Foller Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/03.0005 Tento projekt je spolufinancován ESF a SR ČR 2014 CHROMOSOMAL MUTATIONS chromosomal aberations they do not change genes like that they change the structure of chromosomes change in the extension of hundred genes they can be observed by light microscope significantly bigger extension of phenotypical changes breaking of chromosome occur CHROMOSOMAL MUTATIONS they arise after: breaking of a chromosome breaking of a chromatid following reconnection or the loss of the broken section CHROMOSOMAL MUTATIONS deficiency – loss of the fragment between two breaks on the chromosome arm after short deletions can occur connection; so called chromosomal ring translocation = transpose of a chromosome part on another chromosome after break of the end sections of two different chromosomes and after reciprocal exchange – reciprocal translocation CHROMOSOMAL MUTATIONS deletion = loss of an internal chromosome part inversion= reverse of a chromosome section duplication = doubling of a chromosome part fragmentation = break-up of a chromosome into more parts CHROMOSOMAL ABERATIONS CHROMOSOMAL MUTATIONS in contrast to gene mutations chromosomal mutations (aberrations) can be an obstacle in normal process of meiosis gametes are sterile zygotes not vital CHROMOSOMAL MUTATIONS in contrast to gene mutations chromosomal mutations can be an obstacle in normal process of cell division chromosome without a centromere cannot connect to the dividing spindle > it disappears CHROMOSOMAL MUTATIONS chromosomal mutations are an obstacle in normal process of meiotic division by meiosis it disables synapsis abnormal gametes arise after fertilization defect zygotes arise CHROMOSOMAL MUTATIONS chromosomal mutations arise relatively often it occurs at about 5 % zygotes arisen by fertilization of gametes carrying chromosomal mutations defect zygotes though mainly die at the beginning of embryonal development WORKSHEET DESCRIBE THE PICTURE WORKSHEET DESCRIBE THE PICTURE SOURCES CHALUPOVÁ-KARLOVSKÁ, Vlastimila. Obecná biologie: středoškolská učebnice : evoluce, biologie buňky, genetika : s 558 řešenými testovými otázkami. 2., opr. vyd. Olomouc: Nakladatelství Olomouc, 2010, 206 s. ISBN 978-80-7182-282-0