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Chapter 1: Q. 11 (page 7)

Which of the following are true of epigenetic changes?

a. allow DNA to be transcribed

b. move histones to open or close a chromosomal region

c. are temporary

d. all of the above

Short Answer

Expert verified

Option d is the correct answer

Step by step solution

01

Introduction

The field of epigenetics investigates how your behaviour and environment can affect how your genes work. While epigenetic alterations are reversible and do not alter your DNA sequence like genetic changes do, they can alter how your body interprets a DNA sequence.

02

The explanation for the correct answer

Genes can be turned on or off by means of epigenetic mechanisms that regulate access to the chromosomal area. Chromatin remodelling regulates how tightly the DNA is coiled around histone proteins to govern how much DNA is crammed into the nucleus. To selectively quiet particular genes, the DNA itself may be methylated. A chromosomal area is opened or closed when chemical modifications (or flags) are added to or removed from histone proteins or DNA. The DNA sequence is not altered by epigenetic alterations, which are reversible.

03

The explanation for the incorrect options

No incorrect options are available.

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