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Q: Why a large portion of human genome consists of non-coding introns hypothesize some reasons?
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Noncoding portion of DNA is composed of?

A noncoding portion of DNA is called an intron, and is composed of codons that will eventually be removed after transcription when the final mature strand of mRNA is produced.


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This portion of a DNA segment does not code for a protein?

These are known as introns. There are more than one type. You can always tell an intron from an exon by the fact that exons are the [reassembled] genes that are, after the introns are excised, expressed.


How does the process of meiosis result in different characteristics among individuals?

During chromosome formation, genetic recombination occurs which results in one portion of the sister chromatids to be switched with another in order to increase variety. Also during DNA Replication the introns & exons are forced to reorganize with the introns removed for they are non-coding sequences of DNA. This allows more proteins to be created from less DNA while simultaneously increasing variety in an organism.