Larger genomes do not necessarily indicate greater biological complexity.
Key contributors to variation include:
Non-coding DNA: repetitive sequences, introns, and transposable elements.
Polyploidy: whole-genome duplication, especially common in plants.
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Question 1
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When planning a whole-genome sequencing project, why is it important to know the C-value of the target organism?
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What is the first step in extracting genome size data?
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Note
A genome refers to the complete set of genetic material in an organism, including all of its DNA sequences. The size of a genome is typically measured in base pairs (bp) or more commonly in millions of base pairs (Mbp) or gigabases (Gb).
The human genome is approximately 3.2 billion base pairs (or 3,200 Mbp) in length.
Genome size can vary dramatically between species, from less than 1 Mbp in some bacteria to over 100,000 Mbp in certain plants.
DefinitionGenomeThe total genetic content of an organism, including all of its DNA sequences.
AnalogyThink of a genome as a library containing all the books (genes) that provide instructions for building and maintaining an organism. The genome size is like counting the total number of pages in the library.