Multiple Choice
Which of the following modifications is found most often with open chromatin?
7. Gene Expression
Epigenetic Regulation of Gene Expression
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Which of the following is not a form of epigenetic heredity?
A
Cell memory
B
X inactivation
C
CpG islands
D
Genomic imprinting
Verified step by step guidance1
Understand the concept of epigenetic heredity: Epigenetic heredity involves changes in gene expression that do not involve alterations to the underlying DNA sequence. These changes can be passed down to subsequent generations.
Identify the forms of epigenetic heredity: Common forms include cell memory, X inactivation, and genomic imprinting. Each of these involves mechanisms that regulate gene expression without changing the DNA sequence.
Define each term: Cell memory refers to the ability of cells to remember their identity and function through epigenetic marks. X inactivation is a process in female mammals where one of the X chromosomes is inactivated to balance gene expression. Genomic imprinting is a phenomenon where certain genes are expressed in a parent-of-origin-specific manner.
Examine CpG islands: CpG islands are regions of DNA with a high frequency of cytosine and guanine nucleotides linked by a phosphate bond. They are often associated with gene promoters and can be involved in gene regulation, but they are not a form of epigenetic heredity themselves.
Conclude which option is not a form of epigenetic heredity: Based on the definitions and roles, CpG islands are not a form of epigenetic heredity, as they are structural features of DNA rather than mechanisms of heritable gene expression changes.
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