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Genomic Comparison quiz

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  • What does comparing genomic sequences between organisms help us understand?
    It provides insight into evolutionary changes and the history of life on Earth.
  • How do genomic sequences of two species differ?
    They differ by the length of time the species have separately evolved from a common ancestor.
  • What is purifying selection in genomic comparison?
    Purifying selection is when mutations in critical genes cause death, preventing those mutations from accumulating.
  • Why are conserved sequences similar across distantly related organisms?
    Because mutations in these critical genes are eliminated, so their sequences remain similar across species.
  • What percentage of genes are typically conserved across species?
    About 5% of genes are conserved across distantly related organisms.
  • What is synteny in the context of genomics?
    Synteny refers to the conservation of the order of genes on chromosomes across different organisms.
  • Why is gene order important in synteny?
    Because the order of genes is critical for their function and is conserved across species.
  • Does a larger genomic size mean an organism is more complex or has more genes?
    No, genomic size does not directly correlate with organism complexity or gene count.
  • What information does genomic size provide when comparing organisms?
    It reflects the rates of DNA addition or loss but not the complexity or number of genes.
  • What is a phylogenetic tree and how is it constructed?
    A phylogenetic tree is constructed using DNA sequences to trace relationships between organisms.
  • Which changes occur more rapidly: introns or conserved genes?
    Changes in introns occur more rapidly than in conserved genes with critical functions.
  • Why do introns mutate more freely than conserved genes?
    Because introns are non-coding regions and are not essential for life, so mutations are tolerated.
  • How does genome size vary among bacteria, algae, mammals, and flowering plants?
    Bacteria and algae generally have smaller genomes, while flowering plants can have much larger genomes than mammals.
  • Are flowering plants necessarily more complex than humans because they have larger genomes?
    No, flowering plants can have larger genomes but are not necessarily more complex than humans.
  • What misconception about genomic size is debunked by genomic comparisons?
    The misconception that larger genomes mean more genes or greater organism complexity is debunked.