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USMLE Step 1 Bits & Pieces High yield short focused points, monographs, charts, illustrations, tables, and other stuff related to the USMLE Step 1 Exam.


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Old 09-08-2009
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Arrow Answering Family Pedigree Questions
Family pedigree questions are common in USMLE and they frequently make us scratch our heads!

Here's a flow chart that may help

Answering Family Pedigree Questions-solving-family-pedigree-flow-chart-002.png
click image to enlarge

If you have nice challenging family pedigree questions post your replies to this thread



Last edited by Sabio; 09-09-2009 at 10:29 AM.
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Old 09-08-2009
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Nice flowchart!
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Can you believe that I've got a multifactorial disease pedigree!
It was hypertension
I don't think your rules work in such cases
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Old 10-13-2009
 
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Just wanted to share something with you

I have seen a question showing a typical autosomal recessive inheritance and then the correct answer was down syndrome !!!
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Old 10-13-2009
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Quote:
Originally Posted by flex View Post
Just wanted to share something with you

I have seen a question showing a typical autosomal recessive inheritance and then the correct answer was down syndrome !!!
Woe
It has been said that Down syndrome due to Roberstonian translocation may follow an inheritance pattern similar to autosomal recessive.

This is really a tricky question, but they must hint you about Down in some other ways other than the family pedigree otherwise no genius can answer it.



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Old 05-27-2011
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Default genetic pedigree & to determine the most likely mode of inheritance
Pretty nice video teaching how to determine the most likely mode of inheritance:

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