Diagram a gene showing the critical features that could be used to determine if a particular region of DNA sequence represents a gene or not.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Diagram a gene showing the critical features that could be used to determine if a particular region of DNA sequence represents a gene or not.

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locating genes is easy because protein coding DNA sequences begin with the three bases ATG that code for methionine [AUG codon]. But this is not straightforward because methionine codons are also found within genes.


the gene sequence ends with one of the 3 stop codons, TAA, TAG or TGA, so using these, the end of a gene region can be found out. 


Unfortunately, finding genes isn't always so easy because we might come across open reading frames [ORF]. An ORF is any stretch of DNA that when transcribed into RNA has no stop codon

 

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