Bioinformatics Mcqs

Page No. 57

Which of the following is incorrect regarding the advantages of Molecular data for phylogenetics study?


aThey are more numerous than fossil records


bThey are easier to obtain as compared to fossil records


cSampling bias is involved


dMore clear-cut and robust phylogenetic trees can be constructed with the molecular data



he descriptions of morphological traits are often _____ which are due to _____


a ambiguous, multiple genetic factors


b lucid, more than one genetic factors


c clear, multiple genetic factors


d ambiguous, one or two genetic factors



Phylogenetics is the study of the evolutionary history of living organisms using treelike diagrams to represent pedigrees of these organisms.


a True


b False


ceither true false


dnone of these


View Answer True

The second step in phylogenetic analysis is to construct sequence alignment. This is probably the most critical step in the procedure because it establishes positional correspondence in evolution


a True


bFalse


ceither true and false


dnone of these


View Answer True

Which of the following is incorrect statement about Choosing Substitution Models?


aThere is one substitution at a particular position, in divergent sequences


b The evolutionary divergence is beyond the ability of the statistical models to correct


c The statistical models used to correct homoplasy are called substitution models or evolutionary models


dFor constructing DNA phylogenies, there are nucleotide substitution models availableFor constructing DNA phylogenies, there are nucleotide substitution models available



Which of the following is incorrect statement about the Kimura model?


a It is a model to correct evolutionary distances and is a more sophisticated model


bIn this, the mutation rates for transitions and transversion are assumed to be different


cAccording to this model, occur more frequently than transversions


dAccording to this model, transversions occur more frequently than transitions



It is often desirable to define the root of a tree. There are two ways to define the root of a tree. One is to use an outgroup, which ______


ais a sequence that is homologous to the sequences under consideration


bis separated from those sequences at an early evolutionary time


cs generally determined from independent sources of information


d is generally determined from similar or related sources of information



To obtain a species phylogeny, phylogenetic trees from a variety of gene families need to be constructed.


a True


bFalse


ceither true and false


dnone of these


View Answer True

The species evolution is the ______ of evolution by _____ in a genome.


acombined result, multiple genes


b result, single genes


cresult, sole genes


d distinct results, single gene



Evolution of a particular sequence _______ correlate with the evolutionary path of the species.


a does not


balways


cdoes not necessarily


dinvariably


View Answer does not necessarily

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