Value Paradox

There appears to be a great deal more DNA in eukaryotic organisms than is actually needed to code for the number of genes estimated for a specific species. This discrepancy is known as the C value paradox. Genome size seems to bear little relationship to organismal complexity or the number of genes encoded. For example, genome size varies widely among insect species, with up to 250-fold differences in C values known Petrov et al. 2000 . The locust Schistocerca gregaria has a C value of...

Synthesis Of Pre-mrna 1 Nucleotide

Chironomus Polysomes

Components of a typical Class II eukaryotic gene that codes for proteins include noncoding introns that are spliced out of the pre-messenger RNA, coding exons shown in black , a promoter to which RNA polymerase II attaches to initiate RNA synthesis, and several enhancers here numbered 1-6 that influence gene regulation. Figure 2.4. A more detailed view of a eukaryotic class II gene that codes for proteins. Promoters often have CAAT and TATA boxes upstream from the start site. The...