171. Gaps in certain regions of the genome have been observed upon sequencing of a xerohalophyte. Which one
of the following databases will NOT be of any use in filling up these gaps?
1. EST database
2. Full length cDNA database
3. RefSeq database
4. QTL database
Introduction to Genome Gaps and Databases
During the sequencing of a xerohalophyte genome, gaps may arise in certain regions that are difficult to sequence or map. Various databases are available to assist in filling these gaps or helping researchers make sense of the genome. However, not all databases are useful for this purpose. Some databases are designed for different types of genetic data, and in this article, we will discuss which one will not aid in filling genome gaps for a xerohalophyte species.
Which Database Will NOT Be Useful in Filling Genome Gaps?
1. EST Database (Expressed Sequence Tag)
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ESTs are short, single-pass sequences from cDNA libraries. They are derived from mRNA and represent expressed genes. These sequences can help in identifying gene sequences and filling gaps in regions of the genome that are related to gene expression.
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Useful for gap filling.
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Incorrect Answer.
2. Full-Length cDNA Database
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Full-length cDNA databases contain complete cDNA sequences that represent the entire coding regions of genes. This information is critical for identifying coding regions and filling gaps in the genome related to gene structures.
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Useful for gap filling.
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Incorrect Answer.
3. RefSeq Database
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RefSeq (Reference Sequence) is a comprehensive collection of sequences of genes, chromosomes, and genomes that serve as reference sequences for species. It is regularly updated and provides curated data for genome annotation.
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This database can be used to fill gaps in genomic sequences, especially in well-annotated regions.
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Useful for gap filling.
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Incorrect Answer.
4. QTL Database (Quantitative Trait Loci)
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A QTL database provides information about the location of genetic markers linked to traits. QTL mapping is useful for identifying regions in the genome that affect traits like drought resistance or salt tolerance, but it does not provide direct sequence data that could be used to fill gaps in the genome.
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Not useful for gap filling.
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Correct Answer.
Conclusion:
The QTL database is not useful for filling gaps in genomic sequences, as it focuses on trait-marker associations and does not contain sequence information. The other databases—EST, full-length cDNA, and RefSeq—contain sequence data that can help in filling gaps related to genes and their expression.
Correct Answer:
4. QTL Database
The QTL database will not be useful in filling genome gaps in a xerohalophyte species.
