Multiple Choice
Which principle is NOT used to construct a phylogenetic tree?
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22. Evolutionary Genetics
Phylogenetic Trees
2:07 minutesProblem D.4
Textbook Question
Discuss how both gains and losses of regulatory elements may lead to human-specific traits.
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Begin by defining regulatory elements in genetics: these are DNA sequences such as enhancers, silencers, promoters, and insulators that control the expression of genes without altering the protein-coding sequence itself.
Explain that gains of regulatory elements refer to the acquisition of new regulatory sequences or the modification of existing ones, which can lead to novel patterns of gene expression unique to humans, potentially contributing to human-specific traits.
Discuss how losses of regulatory elements involve the deletion or inactivation of certain regulatory sequences, which can reduce or eliminate gene expression in specific contexts, also resulting in traits that distinguish humans from other species.
Illustrate with examples how changes in regulatory elements can affect developmental pathways, brain function, or other physiological processes, emphasizing that these changes can be subtle but have significant phenotypic effects.
Conclude by highlighting that both gains and losses of regulatory elements contribute to evolutionary divergence by altering gene expression patterns, thereby shaping human-specific traits without changing the underlying protein-coding genes.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Regulatory Elements in Genetics
Regulatory elements are DNA sequences such as enhancers, silencers, and promoters that control gene expression levels. They do not code for proteins but influence when, where, and how much a gene is expressed, playing a crucial role in development and phenotype.
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Human Transposable Elements
Gene Expression and Phenotypic Variation
Changes in gene expression, driven by regulatory elements, can lead to differences in traits without altering the underlying protein-coding genes. Variations in expression patterns contribute to phenotypic diversity, including species-specific characteristics.
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Evolutionary Impact of Gains and Losses of Regulatory Elements
Gains (e.g., new enhancers) or losses (e.g., deletion of silencers) of regulatory elements can modify gene expression patterns, leading to novel traits or loss of ancestral traits. Such changes are key mechanisms in human evolution, contributing to traits unique to our species.
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