FIGURE 5. Limited homology between the human sex chromosomes illustrates the extent of Y chromosome erosion in non-recombining regions.
From the following article:
The DNA sequence of the human X chromosome
Mark T. Ross, Darren V. Grafham, Alison J. Coffey, Steven Scherer, Kirsten McLay, Donna Muzny, Matthias Platzer, Gareth R. Howell, Christine Burrows, Christine P. Bird, Adam Frankish, Frances L. Lovell, Kevin L. Howe, Jennifer L. Ashurst, Robert S. Fulton, Ralf Sudbrak, Gaiping Wen, Matthew C. Jones, Matthew E. Hurles, T. Daniel Andrews, Carol E. Scott, Stephen Searle, Juliane Ramser, Adam Whittaker, Rebecca Deadman, Nigel P. Carter, Sarah E. Hunt, Rui Chen, Andrew Cree, Preethi Gunaratne, Paul Havlak, Anne Hodgson, Michael L. Metzker, Stephen Richards, Graham Scott, David Steffen, Erica Sodergren, David A. Wheeler, Kim C. Worley, Rachael Ainscough, Kerrie D. Ambrose, M. Ali Ansari-Lari, Swaroop Aradhya, Robert I. S. Ashwell, Anne K. Babbage, Claire L. Bagguley, Andrea Ballabio, Ruby Banerjee, Gary E. Barker, Karen F. Barlow, Ian P. Barrett, Karen N. Bates, David M. Beare, Helen Beasley, Oliver Beasley, Alfred Beck, Graeme Bethel, Karin Blechschmidt, Nicola Brady, Sarah Bray-Allen, Anne M. Bridgeman, Andrew J. Brown, Mary J. Brown, David Bonnin, Elspeth A. Bruford, Christian Buhay, Paula Burch, Deborah Burford, Joanne Burgess, Wayne Burrill, John Burton, Jackie M. Bye, Carol Carder, Laura Carrel, Joseph Chako, Joanne C. Chapman, Dean Chavez, Ellson Chen, Guan Chen, Yuan Chen, Zhijian Chen, Craig Chinault, Alfredo Ciccodicola, Sue Y. Clark, Graham Clarke, Chris M. Clee, Sheila Clegg, Kerstin Clerc-Blankenburg, Karen Clifford, Vicky Cobley, Charlotte G. Cole, Jen S. Conquer, Nicole Corby, Richard E. Connor, Robert David, Joy Davies, Clay Davis, John Davis, Oliver Delgado, Denise DeShazo, Pawandeep Dhami, Yan Ding, Huyen Dinh, Steve Dodsworth, Heather Draper, Shannon Dugan-Rocha, Andrew Dunham, Matthew Dunn, K. James Durbin, Ireena Dutta, Tamsin Eades, Matthew Ellwood, Alexandra Emery-Cohen, Helen Errington, Kathryn L. Evans, Louisa Faulkner, Fiona Francis, John Frankland, Audrey E. Fraser, Petra Galgoczy, James Gilbert, Rachel Gill, Gernot Glöckner, Simon G. Gregory, Susan Gribble, Coline Griffiths, Russell Grocock, Yanghong Gu, Rhian Gwilliam, Cerissa Hamilton, Elizabeth A. Hart, Alicia Hawes, Paul D. Heath, Katja Heitmann, Steffen Hennig, Judith Hernandez, Bernd Hinzmann, Sarah Ho, Michael Hoffs, Phillip J. Howden, Elizabeth J. Huckle, Jennifer Hume, Paul J. Hunt, Adrienne R. Hunt, Judith Isherwood, Leni Jacob, David Johnson, Sally Jones, Pieter J. de Jong, Shirin S. Joseph, Stephen Keenan, Susan Kelly, Joanne K. Kershaw, Ziad Khan, Petra Kioschis, Sven Klages, Andrew J. Knights, Anna Kosiura, Christie Kovar-Smith, Gavin K. Laird, Cordelia Langford, Stephanie Lawlor, Margaret Leversha, Lora Lewis, Wen Liu, Christine Lloyd, David M. Lloyd, Hermela Loulseged, Jane E. Loveland, Jamieson D. Lovell, Ryan Lozado, Jing Lu, Rachael Lyne, Jie Ma, Manjula Maheshwari, Lucy H. Matthews, Jennifer McDowall, Stuart McLaren, Amanda McMurray, Patrick Meidl, Thomas Meitinger, Sarah Milne, George Miner, Shailesh L. Mistry, Margaret Morgan, Sidney Morris, Ines Müller, James C. Mullikin, Ngoc Nguyen, Gabriele Nordsiek, Gerald Nyakatura, Christopher N. O'Dell, Geoffery Okwuonu, Sophie Palmer, Richard Pandian, David Parker, Julia Parrish, Shiran Pasternak, Dina Patel, Alex V. Pearce, Danita M. Pearson, Sarah E. Pelan, Lesette Perez, Keith M. Porter, Yvonne Ramsey, Kathrin Reichwald, Susan Rhodes, Kerry A. Ridler, David Schlessinger, Mary G. Schueler, Harminder K. Sehra, Charles Shaw-Smith, Hua Shen, Elizabeth M. Sheridan, Ratna Shownkeen, Carl D. Skuce, Michelle L. Smith, Elizabeth C. Sotheran, Helen E. Steingruber, Charles A. Steward, Roy Storey, R. Mark Swann, David Swarbreck, Paul E. Tabor, Stefan Taudien, Tineace Taylor, Brian Teague, Karen Thomas, Andrea Thorpe, Kirsten Timms, Alan Tracey, Steve Trevanion, Anthony C. Tromans, Michele d'Urso, Daniel Verduzco, Donna Villasana, Lenee Waldron, Melanie Wall, Qiaoyan Wang, James Warren, Georgina L. Warry, Xuehong Wei, Anthony West, Siobhan L. Whitehead, Mathew N. Whiteley, Jane E. Wilkinson, David L. Willey, Gabrielle Williams, Leanne Williams, Angela Williamson, Helen Williamson, Laurens Wilming, Rebecca L. Woodmansey, Paul W. Wray, Jennifer Yen, Jingkun Zhang, Jianling Zhou, Huda Zoghbi, Sara Zorilla, David Buck, Richard Reinhardt, Annemarie Poustka, André Rosenthal, Hans Lehrach, Alfons Meindl, Patrick J. Minx, LaDeana W. Hillier, Huntington F. Willard, Richard K. Wilson, Robert H. Waterston, Catherine M. Rice, Mark Vaudin, Alan Coulson, David L. Nelson, George Weinstock, John E. Sulston, Richard Durbin, Tim Hubbard, Richard A. Gibbs, Stephan Beck, Jane Rogers and David R. Bentley
Nature 434, 325-337(17 March 2005)
doi:10.1038/nature03440
a, BLASTN alignments (length 
80 bp, sequence identity 70%) between the finished sequences of the X and Y chromosomes. The centromere positions are represented by grey bars. The analysed Y chromosome sequence ends at the large, heterochromatic segment on Yq, which is indicated by the black bar on the truncated Y chromosome ideogram. b, Major blocks of homology remaining between the XAR and the YAR. Expansion of the BLASTN plot from 0–12 Mb on the X chromosome and 0–20 Mb on the Y chromosome. On the X chromosome, the major homologies lie in the terminal 8.5 Mb of Xp: PAR1 (magenta line) and numbered blocks 1–10. Lesser homologies 11 and 12 contain the TBL1X/TBL1Y and AMELX/AMELY genes, respectively. c, The XTR region in detail (88–93 Mb on X and 2.8–6.8 Mb on Y). Black arrows show large segments deleted from the Y chromosome copy of the XTR. The magenta arrow indicates the short segment that is separated from the rest of the XTR by a paracentric inversion on the Y chromosome. An independent inversion polymorphism on Yp in human populations encompasses this small segment. The position and orientation of the segment shows that the Y chromosome reference sequence is of the less common, derived Y chromosome.
