Bio II Slide Set VII

Bio II Slide Set VII - UNIT II: SLIDE SET VII I. Extensions...

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Unformatted text preview: UNIT II: SLIDE SET VII I. Extensions of Mendels Rules (continued) E. Sex Linked Inheritance 1. Sex chromosomes 2. Systems of sex determination a. XY system b. X0 systems c. ZW systems d. Haplo-diploid systems e. Non-chromosomal sex determination 3. X-linked inheritance 4. Y-linked inheritance 5. Effects of sex on autosomal traits Monday, June 13, 2011 II. Pedigree analysis A. Symbols B. Analyzing modes of inheritance using pedigrees C. Examples III. Human genetic abnormalities A. Chromosome abnormalities 1. Aneuploidy and non-disjunction a. Down syndrome b. Turner syndrome c. Klinefelter syndrome 2. Chromosomal mutations B. Dominantly and recessively inherited disorders Monday, June 13, 2011 IV. Genetic Testing A. Molecular detection of speciFc alleles B. Pedigree analysis C. etal testing 1. amniocentesis 2. chorionic villus sampling (CVS) 3. ultrasound 4. etoscopy D. Newborn screening E. Gene therapy . Ethics/privacy issues V. Nature vs. Nurture A. Phenotypic plasticity 1. the norm of reaction 2. examples Monday, June 13, 2011 Exceptions to Mendels rules (contd): 4. Individuals have 2 versions (alleles) for each gene (i.e., alleles occur on homologous pairs of chrsomes) Exception: genes on the X or Y chromosomes (= sex-linked genes: genes linked to or found on one of the sex chromosomes) Monday, June 13, 2011 Y chromosome (replicated) Fig. 15.5 (7 th : p. 282) X chromosome (replicated) Monday, June 13, 2011 Y chromosome (replicated) in humans and many other species, the composition of the sex chromosomes varies between males and females. Fig. 15.5 (7 th : p. 282) X chromosome (replicated) Monday, June 13, 2011 Y chromosome (replicated) in humans and many other species, the composition of the sex chromosomes varies between males and females. females XX , males XY Fig. 15.5 (7 th : p. 282) X chromosome (replicated) Monday, June 13, 2011 Y chromosome (replicated) in humans and many other species, the composition of the sex chromosomes varies between males and females. females XX , males XY these X and Y chromosomes can have some same & some different genes Fig. 15.5 (7 th : p. 282) X chromosome (replicated) Monday, June 13, 2011 Y chromosome (replicated) in humans and many other species, the composition of the sex chromosomes varies between males and females. females XX , males XY these X and Y chromosomes can have some same & some different genes but the X and Y act like homologues during meiosis because of pseudoautosomal regions (regions in common) Fig. 15.5 (7 th : p. 282) X chromosome (replicated) Monday, June 13, 2011 Human copyright 1994 David Adler http://www.pathology.washington.edu/research/cytopages/idiograms/human/ http://www.pathology.washington.edu/galleries/Cytogallery/main.php?file=human%20karyotypes RECALL: human male and female karyotypes male female no Y Monday, June 13, 2011 humans: XX (female) x XY (male) male gametes: 1/2 X 1/2 Y female 1/1 X gametes (only X is possible) 1/2 XX 1/2 XY Monday, June 13, 2011 humans:...
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Bio II Slide Set VII - UNIT II: SLIDE SET VII I. Extensions...

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