genetics question - timpu - Printable Version +- USMLE Forum - Largest USMLE Community (https://www.usmleforum.com) +-- Forum: USMLE Forum (https://www.usmleforum.com/forumdisplay.php?fid=1) +--- Forum: Step 1 (https://www.usmleforum.com/forumdisplay.php?fid=2) +--- Thread: genetics question - timpu (/showthread.php?tid=106216) |
genetics question - timpu - ArchivalUser - 07-31-2006 30 yr old man phenotypically normal, with 2 siblings died from tay sachs. what is the risk that this man is a heterogygous carrier of disease causing mutation 1) 1/4 2) 1/2 3) 2/3 4) 3/4 5) not elevated above the general population 0 - ArchivalUser - 07-31-2006 3)2/3 Either he is homozygous normal or hetreozygous carrier..in that either he got the defective allele frm mother OR father so TOTAL 3 possibilities....and 2 of them lead to heterozygous state so 2/3. 0 - ArchivalUser - 07-31-2006 333 0 - ArchivalUser - 07-31-2006 2 may be the answer. 0 - ArchivalUser - 07-31-2006 ya 2/3 is the answer. sorry for mistake. 0 - ArchivalUser - 07-31-2006 yes 2/3 is the right answer. |