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Chapter 10: Problem 22

Which of the following terms should not be used to describe a Barr body? A. Chromatin B. Euchromatin C. Heterochromatin D. Chromosome E. Genome

Short Answer

Expert verified
The term that should not be used to describe a Barr body is 'Euchromatin'. A Barr body is a densely packed form of chromatin, which is referred to as 'heterochromatin' whereas 'euchromatin' is a lightly packed form of chromatin.

Step by step solution

01

Understanding terms

Firstly, get familiar with the provided terms. 'Chromatin', 'euchromatin', 'heterochromatin', 'chromosome', and 'genome' are all related to genetic material and DNA. Among them, chromatin, heterochromatin, and chromosome can legitimately describe a Barr body. On the other hand, 'genome' describes the entire set of genetic material and 'euchromatin' describes a less densely packed form of chromatin.
02

Identifying relevent and irrelevant terms

A Barr body is tightly packed and hence, can be described as heterochromatin. Also, since a Barr body is an inactivated X chromosome, the term 'chromosome' applies as well. Being a form of genetic material, it can also, to some extent, be called chromatin. Hence, these terms are relevant.
03

Eliminating terms

To narrow down the options, we can eliminate 'genome' as it is too broad a term to be used to describe a specific phenomenon like Barr body. Similarly, we can eliminate 'euchromatin' as Barr bodies are densely packed, and hence are not lightly packed like euchromatin.

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