Scelta multipla
In the study of phylogeny, how do systematists determine if a character is ancestral or derived?
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25. Phylogeny
Introduction to Phylogeny
Scelta multipla
Which phylogenetic model does not account for horizontal gene transfer?
A
Reticulate model
B
Tree model
C
Network model
D
Web model
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Understand the concept of phylogenetic models: Phylogenetic models are used to represent the evolutionary relationships between different species or organisms. These models can vary in complexity and the types of relationships they depict.
Define horizontal gene transfer: Horizontal gene transfer (HGT) is the movement of genetic material between organisms other than through vertical transmission (from parent to offspring). It is a significant factor in the evolution of many organisms, especially bacteria.
Explore the Tree model: The Tree model is a traditional phylogenetic model that represents evolutionary relationships as a branching tree. It assumes that genetic material is passed vertically from ancestors to descendants, without accounting for horizontal gene transfer.
Compare with other models: The Reticulate, Network, and Web models are more complex and can incorporate horizontal gene transfer. These models allow for connections between branches, representing the exchange of genetic material between different lineages.
Conclude which model does not account for HGT: Based on the definitions, the Tree model does not account for horizontal gene transfer, as it only considers vertical transmission of genetic material.
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