Introduction to Genetic Analysis 105

Introduction to Genetic Analysis 105 - Introns IR B A (a)...

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104 Chapter 3 The Chromosomal Basis of Inheritance Figure 3-41 DNA maps for mitochondria and chloroplasts. Many of the organelle genes encode proteins that carry out the energy-producing functions of these organelles (green), whereas others (red and orange) function in protein synthesis. (a) Maps of yeast and human mtDNAs. (Note that the human map is not drawn to the same scale as the yeast map.) (b) The chloroplast genome of the liverwort Marchantia polymorpha. Genes shown inside the map are transcribed clockwise, and those outside are transcribed counterclockwise. IR A and IR B indicate inverted repeats. The drawing in the center of the map depicts a male (upper) and a female (lower) Marchantia plant. [From K. Umesono and H. Ozeki, Trends in Genetics 3, 1987.] Yeast mitochondrial DNA (~ 78 kb) Human mitochondrial DNA (~17 kb) Energy production tRNAs for protein synthesis Nongenic Ribosomal RNAs
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Unformatted text preview: Introns IR B A (a) Poky ( ad + ) ( + ) ( – ) ( ) (b) Poky, Poky, + Poky Normal, Normal Normal Normal, + 2 n 2 Figure 3-42 Explanation of the different results from reciprocal crosses of poky and normal Neurospora. The parent contributing most of the cytoplasm of the progeny cells is called female. Brown shading represents cytoplasm with mitochondria containing the poky mutation, and green shading cytoplasm with normal mitochondria. Note that in (a) the progeny will all be poky, whereas in (b) the progeny are all normal. Hence both crosses show maternal inheritance. The nuclear gene with the alleles ad ± (black) and ad ² (red) is used to illustrate the segregation of the nuclear genes in the 1:1 Mendelian ratio expected for this haploid organism. (a) (b) 44200_03_p73-114 3/3/04 1:48 PM Page 104...
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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