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

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bThey are easier to obtain as compared to fossil records

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cSampling bias is involved

✓


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

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View Answer Sampling bias is involved

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


a ambiguous, multiple genetic factors

✓


b lucid, more than one genetic factors

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c clear, multiple genetic factors

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d ambiguous, one or two genetic factors

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View Answer ambiguous, multiple 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

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ceither true false

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dnone of these

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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

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ceither true and false

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dnone of these

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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

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

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

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

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View Answer There is one substitution at a particular position, in divergent sequences

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

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

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cAccording to this model, occur more frequently than transversions

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dAccording to this model, transversions occur more frequently than transitions

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View Answer According 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

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bis separated from those sequences at an early evolutionary time

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cs generally determined from independent sources of information

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d is generally determined from similar or related sources of information

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View Answer 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

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ceither true and false

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dnone of these

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View Answer True

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


acombined result, multiple genes

✓


b result, single genes

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cresult, sole genes

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d distinct results, single gene

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View Answer combined result, multiple genes

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


a does not

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balways

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cdoes not necessarily

✓


dinvariably

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View Answer does not necessarily

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