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Practice Tests Frequently Asked Questions
Practice Test 1 (2002 Exam)
Select the single best answer for each question.
34. A child is born with multiple congenital anomalies. Karyotype analysis is performed on the child and found to be abnormal. Which of the following results would lead you to perform karyotype analysis on the parents?
a) 47, XY,+21
b) 45,XO
c) 47,XXY
d) 46, XY,rob(6;13)
e) 46, XX
The correct answer is D. The patient's condition is due
to a robertsonian translocation between chromosome 6 and chromosome
13, in which material
on the p arms of these chromosomes has been lost. All of the other choices
are explainable by a one time nondisjunction event
(choices a,
b, and
c),
or the condition
would
not
be detectable
via karyotype analysis (choice e).
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