Synteny Explained: Gene Order Conservation
Synteny refers to the preservation or conservation of gene order across different species, typically relative to their most recent common ancestor.
Analyzing the Options
- Option 1 (gene duplication from a common ancestor): While gene duplication is related to genome evolution, it doesn't specifically define synteny.
- Option 2 (a tree representation of related sequences): This describes phylogenetic trees used in evolutionary biology, not synteny itself.
- Option 3 (the extent of similarity between two sequences): Sequence similarity measures how alike DNA or protein sequences are, which is a broader concept than synteny.
- Option 4 (local conservation of gene order): This accurately describes synteny, focusing on the conserved arrangement of genes in the same order across related species or genomes.
Conclusion
Based on the definition, synteny specifically relates to the local conservation of gene order between genomes.
Important Questions from Molecular Structure of Genes and Chromosomes
Consider the following multiple sequence alignment of four DNA sequences.
$\begin{matrix}A & C & T & A \\ A & C & T & G \\ A & G & T & C \\ A & G & C & T \end{matrix} $
Shannon's entropy of the above alignment is ________.
- All pseudogenes DO NOT code for a __________.
- C-value paradox refers to
The transcription factor X binds a 10 base pair DNA stretch. In the DNA of an organism, X was found to bind at 20 distinct sites. An analysis of these 20 binding sites showed the following distribution:
Base Position in the binding site 1 2 3 4 5 6 7 8 9 10 A 11 0 0 0 16 2 4 0 4 3 T 3 0 19 0 1 3 4 20 2 4 G 4 20 0 0 2 4 6 0 12 2 C 2 0 1 20 1 11 6 0 2 11 What is the consensus sequence for the binding site of X?
- Which of the following statements are CORRECT when a protein sequence database is searched using the BLAST algorithm?
P. A larger E-value indicates higher sequence similarity
Q. E-value < $10^{-10}$ indicates sequence homology
R. A higher BLAST score indicates higher sequence similarity
S. E-value > $10^{10}$ indicates sequence homology
