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NBME 21 Answers
A 7-month-old boy is brought to the physician 2 ...
I like to work backwards.
1) patient has normal testicles on histology, normal appearing penis
this must mean a Y chromosome is present, as testis determining factor is on the y chromosome (see above post point #2). I.e. you can eliminate choice A and B.
Theoretically, 47XY and 47XYY could also present with female genitalia due to lack of MIF, but normal 46XY is more common
FA 2019 pg 608