The number of microRNAs encoded by the genome varies widely among organisms: some species have many miRNA genes and other species have relatively few. Researchers have determined the number of miRNA genes possessed by different species and have made the following observations: Q. The number of miRNA genes found on a chromosome is not correlated with chromosome length. In other words, longer chromosomes do not necessarily have more miRNA genes.

Human Anatomy & Physiology (11th Edition)
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The number of microRNAs encoded by the genome varies widely among organisms: some species have many miRNA genes and other species have relatively few. Researchers have determined the number of miRNA genes possessed by different species and have made the following observations:

Q. The number of miRNA genes found on a chromosome is not correlated with chromosome length. In other words, longer chromosomes do not necessarily have more miRNA genes.

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Micro ribonucleic acids (miRNAs) are small noncoding RNAs that are18- to 28 nucleotides in length. They play a major role in posttranscriptional gene regulation as they suppress the gene expression by binding to complementary segments of messenger RNA (mRNA).

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