Phylogenetics - Bioinformatics MCQ Questions

Explanation: The term "phylogeny" derives from the German Phylogenie, introduced by Haeckel in 1866, and the Darwinian approach to classification became known as the "phyletic" approach

Explanation: True, A phylogenetic diagram can be rooted or unrooted.

Explanation: A rooted tree diagram indicates the hypothetical common ancestor, or ancestral lineage, of the tree.

Explanation: A phylogenetic tree also known as phylogeny or evolutionary tree

Explanation: There is no sampling bias involved, which helps to mend the gaps in real fossil records. Therefore, they have become favorite and sometimes the only information available for researchers to reconstruct evolutionary history. The advent of the genomic era with tremendous amounts of molecular sequence data has led to the rapid development of molecular phylogenetics.

Explanation: At the tips of the branches are present-day species or sequences known as taxa (the singular form is taxon) or operational taxonomic units. The bifurcating point at the very bottom of the tree is the root node, which represents the common ancestor of all members of the tree.

Explanation: The sequence may evolve more or less rapidly than other genes in the genome or may have a different evolutionary history from the rest of the genome owing to horizontal gene transfer events. Thus, the evolution of a particular sequence does not necessarily correlate with the evolutionary path of the species

Explanation: True, An unrooted tree diagram (a network) makes no assumption about the ancestral line, and does not show the origin or "root" of the taxa in question or the direction of inferred evolutionary transformations.

Explanation: In a species tree, the branching point at an internal node represents the speciation event whereas, in a gene tree, the internal node indicates a gene duplication event. The two events may or may not coincide

Explanation: A rooted phylogenetic tree is a directed tree with a unique node — the root — corresponding to the (usually imputed) most recent common ancestor of all the entities at the leaves of the tree.