In which of the following cases will a Barr body be seen?     only XX     XY     XO     only XXY     both XX and XXY

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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  1. In which of the following cases will a Barr body be seen?
       
    only XX
       
    XY
       
    XO
       
    only XXY
       
    both XX and XXY
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Step 1

Barr body was a strongly stained inactivated condensed X chromosome found in each somatic cell of most female mammals and used to determine genetic femaleness (as in pregnancy) — also known as sex chromatin.

A single X chromosome's level of gene activity turns out to be the usual "dosage" for humans. This dosage is given to men because they only have one X chromosome. Women are given the same quantity for a different reason: X-inactivation, which entails turning off one of their two X chromosomes. 

An X chromosome is compacted during X-inactivation to form a tiny, dense structure known as a Barr body.
The majority of the genes on the Barr body are dormant, which means they aren't being transcribed. 

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