Human Genetics Problem Set

Problem 14: Barr body


A Barr body is:

A. the cause of Down's syndrome
B. an amplified gene
C. a polytene chromosome
D. a ribonucleoprotein particle
E. an inactivated X chromosome
One of the two X chromosomes in female somatic cells is visualized as a densely staining body within the nucleus known as a "Barr body."

The Biology Project
University of Arizona
Revised: November 5, 1998
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