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02 Jun 2026, 08:41
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For much of the twentieth century, hereditary traits were understood to be transmitted exclusively through the nucleotide sequences in DNA. While environmental conditions massively impact each individual’s capability to reach genetic potential, it was generally thought impossible for those impacts to be heritable. Although this simplistic model has provided decades of enormous real-world productivity, recent evidence from the emerging field of epigenetics has revealed complications that researchers are only beginning to comprehend.
Epigenetic marks are chemical changes to DNA or associated structures that alter gene expression without changing the DNA’s nucleotide sequence. The two most studied mechanisms are DNA methylation, in which methyl groups attach to cytosine bases and silence nearby genes, and histone modification, in which chemical tags on the proteins around which DNA is wound loosen or tighten the helical shape of the DNA molecule itself, making genes more or less accessible to transcription machinery. Crucially, some of these marks are mitotically stable: they persist through cell division and thus can be transmitted into new cells—enabling the marks to persist longer than the cells’ regenerative cycle, which ranges from a few days for the epithelial cells lining the stomach up to decades for cells in the body’s largest bones.
The same quality also enables the transmission of epigenetic marks into sperm and egg cells, theoretically making possible the phenomenon of transgenerational epigenetic inheritance—the passing of epigenetic marks from parents on to their offspring through the reproductive process. Rodent studies have found altered gene expression patterns in the offspring of animals exposed to stressors such as toxins or nutrient deficiencies, even when the offspring have not been exposed to those stressors. In one well-known set of experiments, male mice fed a low-protein diet sired offspring with markedly altered hepatic gene expression, even though the offspring were raised on standard diets.
Skeptics caution that demonstrating true epigenetic inheritance requires ruling out alternative explanations, including behavioral transmission, microbiome transfer, and conventional genetic mutation. Whether such inheritance operates in humans remains altogether unknown, largely because the human genome has been shown to undergo extensive epigenetic reprogramming during the embryonic and early fetal stages—a process that would be expected to erase most parental marks.
The author most likely cites the low-protein diet experiment with male mice in order to
A. demonstrate that transgenerational epigenetic effects can manifest in offspring without direct environmental exposure
B. prove that dietary modifications can create heritable changes in the nucleotide sequences of DNA
C. provide an example of the behavioral transmission of epigenetic modifications of gene expression
D. suggest that the effects of significant fundamental lifestyle changes in a parent animal are likely to redound to its offspring
E. support the claim that epigenetic marks can be passed from parent to offspring outside the reproductive process
Epigenetic marks are chemical changes to DNA or associated structures that alter gene expression without changing the DNA’s nucleotide sequence. The two most studied mechanisms are DNA methylation, in which methyl groups attach to cytosine bases and silence nearby genes, and histone modification, in which chemical tags on the proteins around which DNA is wound loosen or tighten the helical shape of the DNA molecule itself, making genes more or less accessible to transcription machinery. Crucially, some of these marks are mitotically stable: they persist through cell division and thus can be transmitted into new cells—enabling the marks to persist longer than the cells’ regenerative cycle, which ranges from a few days for the epithelial cells lining the stomach up to decades for cells in the body’s largest bones.
The same quality also enables the transmission of epigenetic marks into sperm and egg cells, theoretically making possible the phenomenon of transgenerational epigenetic inheritance—the passing of epigenetic marks from parents on to their offspring through the reproductive process. Rodent studies have found altered gene expression patterns in the offspring of animals exposed to stressors such as toxins or nutrient deficiencies, even when the offspring have not been exposed to those stressors. In one well-known set of experiments, male mice fed a low-protein diet sired offspring with markedly altered hepatic gene expression, even though the offspring were raised on standard diets.
Skeptics caution that demonstrating true epigenetic inheritance requires ruling out alternative explanations, including behavioral transmission, microbiome transfer, and conventional genetic mutation. Whether such inheritance operates in humans remains altogether unknown, largely because the human genome has been shown to undergo extensive epigenetic reprogramming during the embryonic and early fetal stages—a process that would be expected to erase most parental marks.
The author most likely cites the low-protein diet experiment with male mice in order to
A. demonstrate that transgenerational epigenetic effects can manifest in offspring without direct environmental exposure
B. prove that dietary modifications can create heritable changes in the nucleotide sequences of DNA
C. provide an example of the behavioral transmission of epigenetic modifications of gene expression
D. suggest that the effects of significant fundamental lifestyle changes in a parent animal are likely to redound to its offspring
E. support the claim that epigenetic marks can be passed from parent to offspring outside the reproductive process
02 Jun 2026, 08:41
Kudos
Bookmarks
Official Solution:
For much of the twentieth century, hereditary traits were understood to be transmitted exclusively through the nucleotide sequences in DNA. While environmental conditions massively impact each individual’s capability to reach genetic potential, it was generally thought impossible for those impacts to be heritable. Although this simplistic model has provided decades of enormous real-world productivity, recent evidence from the emerging field of epigenetics has revealed complications that researchers are only beginning to comprehend.
Epigenetic marks are chemical changes to DNA or associated structures that alter gene expression without changing the DNA’s nucleotide sequence. The two most studied mechanisms are DNA methylation, in which methyl groups attach to cytosine bases and silence nearby genes, and histone modification, in which chemical tags on the proteins around which DNA is wound loosen or tighten the helical shape of the DNA molecule itself, making genes more or less accessible to transcription machinery. Crucially, some of these marks are mitotically stable: they persist through cell division and thus can be transmitted into new cells—enabling the marks to persist longer than the cells’ regenerative cycle, which ranges from a few days for the epithelial cells lining the stomach up to decades for cells in the body’s largest bones.
The same quality also enables the transmission of epigenetic marks into sperm and egg cells, theoretically making possible the phenomenon of transgenerational epigenetic inheritance—the passing of epigenetic marks from parents on to their offspring through the reproductive process. Rodent studies have found altered gene expression patterns in the offspring of animals exposed to stressors such as toxins or nutrient deficiencies, even when the offspring have not been exposed to those stressors. In one well-known set of experiments, male mice fed a low-protein diet sired offspring with markedly altered hepatic gene expression, even though the offspring were raised on standard diets.
Skeptics caution that demonstrating true epigenetic inheritance requires ruling out alternative explanations, including behavioral transmission, microbiome transfer, and conventional genetic mutation. Whether such inheritance operates in humans remains altogether unknown, largely because the human genome has been shown to undergo extensive epigenetic reprogramming during the embryonic and early fetal stages—a process that would be expected to erase most parental marks.
The author most likely cites the low-protein diet experiment with male mice in order to
A. demonstrate that transgenerational epigenetic effects can manifest in offspring without direct environmental exposure
B. prove that dietary modifications can create heritable changes in the nucleotide sequences of DNA
C. provide an example of the behavioral transmission of epigenetic modifications of gene expression
D. suggest that the effects of significant fundamental lifestyle changes in a parent animal are likely to redound to its offspring
E. support the claim that epigenetic marks can be passed from parent to offspring outside the reproductive process
The cited experiment is mentioned immediately after the general remark that “rodent studies have found altered gene expression patterns in the offspring of animals exposed to stressors [...] even when the offspring have not been exposed to those stressors”, so it is meant to present a specific instance of that general observation in which mice are the “rodent” in question, the low-protein diet given to the parent mice is the “stressor” that’s causally linked to epigenetic marks, and the altered hepatic gene expression is the “altered gene expression ... in offspring [that] have not been exposed to th[e] stresso[r]”.
To “demonstrate” a principle is to confirm it by providing a specific instance/example, so choice A describes the precise function of the specific instance/example called out here.
INCORRECT ANSWERS:
(B) The dietary modifications cited here are epigenetic factors that cause alterations in “gene expression” i.e., that do not alter the genes (nucleotide sequences in DNA) themselves.
(C) Although the passage does not supply a precise definition of “behavioral transmission” of epigenetic marks, any such phenomenon would at least have to involve imitation of relevant behaviors/actions by the offspring in which modified gene expression is eventually observed. Since the offspring in this instance did NOT consume the special low-protein diet associated with the epigenetic mark (the only associated ‘behavior’ mentioned in the text), the findings of the mouse experiment cannot reasonably involve behavioral transmission.
(D) Not only is this statement far too general, but it entirely fails to mention the actual principle that this example is meant to illustrate namely, the potential inheritance of epigenetic marks and the traits associated with the resultant gene expression
(E) No claims are made about whether the epigenetic mark associated with altered hepatic gene expression in this example was passed down via the reproductive process or via some other route (such as any of the three non-reproductive routes mentioned near the beginning of the last paragraph).
Answer: A
For much of the twentieth century, hereditary traits were understood to be transmitted exclusively through the nucleotide sequences in DNA. While environmental conditions massively impact each individual’s capability to reach genetic potential, it was generally thought impossible for those impacts to be heritable. Although this simplistic model has provided decades of enormous real-world productivity, recent evidence from the emerging field of epigenetics has revealed complications that researchers are only beginning to comprehend.
Epigenetic marks are chemical changes to DNA or associated structures that alter gene expression without changing the DNA’s nucleotide sequence. The two most studied mechanisms are DNA methylation, in which methyl groups attach to cytosine bases and silence nearby genes, and histone modification, in which chemical tags on the proteins around which DNA is wound loosen or tighten the helical shape of the DNA molecule itself, making genes more or less accessible to transcription machinery. Crucially, some of these marks are mitotically stable: they persist through cell division and thus can be transmitted into new cells—enabling the marks to persist longer than the cells’ regenerative cycle, which ranges from a few days for the epithelial cells lining the stomach up to decades for cells in the body’s largest bones.
The same quality also enables the transmission of epigenetic marks into sperm and egg cells, theoretically making possible the phenomenon of transgenerational epigenetic inheritance—the passing of epigenetic marks from parents on to their offspring through the reproductive process. Rodent studies have found altered gene expression patterns in the offspring of animals exposed to stressors such as toxins or nutrient deficiencies, even when the offspring have not been exposed to those stressors. In one well-known set of experiments, male mice fed a low-protein diet sired offspring with markedly altered hepatic gene expression, even though the offspring were raised on standard diets.
Skeptics caution that demonstrating true epigenetic inheritance requires ruling out alternative explanations, including behavioral transmission, microbiome transfer, and conventional genetic mutation. Whether such inheritance operates in humans remains altogether unknown, largely because the human genome has been shown to undergo extensive epigenetic reprogramming during the embryonic and early fetal stages—a process that would be expected to erase most parental marks.
The author most likely cites the low-protein diet experiment with male mice in order to
A. demonstrate that transgenerational epigenetic effects can manifest in offspring without direct environmental exposure
B. prove that dietary modifications can create heritable changes in the nucleotide sequences of DNA
C. provide an example of the behavioral transmission of epigenetic modifications of gene expression
D. suggest that the effects of significant fundamental lifestyle changes in a parent animal are likely to redound to its offspring
E. support the claim that epigenetic marks can be passed from parent to offspring outside the reproductive process
The cited experiment is mentioned immediately after the general remark that “rodent studies have found altered gene expression patterns in the offspring of animals exposed to stressors [...] even when the offspring have not been exposed to those stressors”, so it is meant to present a specific instance of that general observation in which mice are the “rodent” in question, the low-protein diet given to the parent mice is the “stressor” that’s causally linked to epigenetic marks, and the altered hepatic gene expression is the “altered gene expression ... in offspring [that] have not been exposed to th[e] stresso[r]”.
To “demonstrate” a principle is to confirm it by providing a specific instance/example, so choice A describes the precise function of the specific instance/example called out here.
INCORRECT ANSWERS:
(B) The dietary modifications cited here are epigenetic factors that cause alterations in “gene expression” i.e., that do not alter the genes (nucleotide sequences in DNA) themselves.
(C) Although the passage does not supply a precise definition of “behavioral transmission” of epigenetic marks, any such phenomenon would at least have to involve imitation of relevant behaviors/actions by the offspring in which modified gene expression is eventually observed. Since the offspring in this instance did NOT consume the special low-protein diet associated with the epigenetic mark (the only associated ‘behavior’ mentioned in the text), the findings of the mouse experiment cannot reasonably involve behavioral transmission.
(D) Not only is this statement far too general, but it entirely fails to mention the actual principle that this example is meant to illustrate namely, the potential inheritance of epigenetic marks and the traits associated with the resultant gene expression
(E) No claims are made about whether the epigenetic mark associated with altered hepatic gene expression in this example was passed down via the reproductive process or via some other route (such as any of the three non-reproductive routes mentioned near the beginning of the last paragraph).
Answer: A
