So this is an image of a pedigree and it shows how some traits are passed on. During my class we studied a gene that increases the addiction to nicotine. Isn't in intriguing that there is actually a gene that codes for that? Anyway I'm going to break down the very basics of how to read pedigrees, just in case you're ever faced with having to read one.
First, squares represent males and circles represent females. (Think, hard edges: men, smooth edges: women :]). Second, solid or filled shapes men the individual is affected with the gene or trait. Parents to children are bound with a horizontal line and their children are connected to them. It's usually/generally easy to tell. If parents have a set of twins they form a triangle with the lines connecting them to the parents (I know that's confusing, sorry!). If the twins are identical a horizontal line will join the twins, similar to parents. This image doesn't have any deaths, but a death would be represented with a slash through the shape. Last, the roman numerals up and down the left sides represent first, second, and third generations.
Images from: http://www.google.com/imgres?q=pedigree&um=1&hl=en&client=firefox-a&sa=N&rls=org.mozilla:en-US:official&biw=1280&bih=642&tbm=isch&tbnid=DnzhFhiJtMVCJM:&imgrefurl=http://www.uic.edu/classes/bms/bms655/lesson3.html&docid=JXRBTjMR1dmD8M&imgurl=http://www.uic.edu/classes/bms/bms655/gfx/pedigree1.gif&w=503&h=334&ei=8YTnTsaXBIX9iQK4ou36Bg&zoom=1&iact=hc&vpx=832&vpy=187&dur=1890&hovh=183&hovw=276&tx=136&ty=92&sig=115968425815851733043&page=1&tbnh=112&tbnw=169&start=0&ndsp=18&ved=1t:429,r:4,s:0
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