IB Biology Topic D2.2.9: Consequences of Removal of Most But Not All Epigenetic Tags from the Ovum and Sperm Notes

Most Tags Are Erased in Gametes, But a Few Persist as Genomic Imprints

During the formation of gametes, most epigenetic tags are erased to give the next generation a clean slate.

These tags, such as DNA methylation and histone modification, change gene expression without altering the DNA sequence.

A small fraction of tags are not erased, leading to genomic imprinting, where certain genes are silenced depending on which parent they came from.

Definition

Genomic imprinting

Genomic imprinting is a form of epigenetic inheritance, where the expression of a gene depends on whether it is inherited from the mother or the father.

Note

Imprinted genes are expressed from only one parent's copy, while the other copy stays silenced.
This is why some inherited effects depend on whether a gene came from the mother or the father.

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IB Biology Topic D2.2.9: Consequences of Removal of Most But Not All Epigenetic Tags from the Ovum and Sperm Notes

IB Biology Topic D2.2.9: Consequences of Removal of Most But Not All Epigenetic Tags from the Ovum and Sperm Notes

Most Tags Are Erased in Gametes, But a Few Persist as Genomic Imprints

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

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Excepteur sint occaecat cupidatat non proident

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Most Tags Are Erased in Gametes, But a Few Persist as Genomic Imprints

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IB Biology Topic D2.2.9: Consequences of Removal of Most But Not All Epigenetic Tags from the Ovum and Sperm Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D2.2.9: Consequences of Removal of Most But Not All Epigenetic Tags from the Ovum and Sperm Notes

Most Tags Are Erased in Gametes, But a Few Persist as Genomic Imprints

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Most Tags Are Erased in Gametes, But a Few Persist as Genomic Imprints

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics