McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

What is a Barr body?

A. a duplicated centriole
B. the structure that controls a flagellum
C. a condensed chromosome prior to mitosis
D. an inactivated X chromosome


2. During what stage of development do Barr bodies appear?

A. During puberty, one X chromosome is inactivated in each cell.
B. At birth, the process of X chromosome inactivation begins.
C. During embryonic development, one X chromosome is inactivated at random in each cell.
D. X chromosome inactivation is continuous throughout the life of the individual.
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