estructura molecular de genes y cromosomas
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Copyright (c) by W. H. Freeman and Company
Chapter 9
Molecular Structure of Genes and Chromosomes
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9.5 The solenoid model of condensed chromatin
Figure 9-31
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9.2 Simple-sequence DNAs are concentrated in specific chromosomal locations
Figure 9-6
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9.6 A model for chromatin packing in metaphase chromosomes
Figure 9-35
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Copyright (c) by W. H. Freeman and Company
9.6 Experimental demonstration of chromatin loops in interphase chromosomes
Figure 9-36
Sites A-F are separated by millions of bp of linear sequence but are physically close to each other in interphase nuclei
Copyright (c) by W. H. Freeman and Company
Copyright (c) by W. H. Freeman and Company
9.6 Heterochromatin consists of chromosome regions that do not uncoil
Figure 9-39
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9.6 Chromosome painting distinguishes each homologous pair by color
Figure 9-0
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9.6 Stained chromosomes have characteristic banding patterns
Figure 9-38
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DEFINICION MOLECULAR DE GEN
Un gen es una secuencia completa de ADN que es necesaria para la sintesis de uno o más polipéptido funcional en un momento determinado.
Regiones de ADN que codifican para moleculas de ARN como ARNt y ARNr tambien son consideradas genes.
En eucariotes, los genes permanecen en medio de segmentos no codificantes, no funcionales de ADN.
Copyright (c) by W. H. Freeman and Company
Copyright (c) by W. H. Freeman and Company
Copyright (c) by W. H. Freeman and Company
Copyright (c) by W. H. Freeman and Company
9.1 Simple and complex transcription units are found in eukaryotic genomes
Figure 9-2
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9.2 Genomes of higher eukaryotes contain much nonfunctional DNA
Figure 9-3
Amongst eukaryotes, cellular DNA content does not correlate with phylogeny.
Copyright (c) by W. H. Freeman and Company
Copyright (c) by W. H. Freeman and Company
Copyright (c) by W. H. Freeman and Company
9.3 The two classes of mobile elements
Figure 9-10
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Los elementos moviles probablemente tienen influencia significativa en la evolución
Mutaciones espontaneas pueden resultar de la inserción de un elemento movil dentro o cerca de una unidad de un gen.
Recombinación homologa entre elementos móviles pueden contribuir a la duplicación u otros re arreglos, incluyendo duplicacion de intrones , recombinación de intrones para creas nuevos genes y control de expresión de genes.
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9.5 Nucleosomes are complexes of histones
Figure 9-30
Copyright (c) by W. H. Freeman and Company
9.7 Human mtDNA
Figure 9-44
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