Explain how genes are expressed for a particular trait.

One gene for a particular trait is transcribed from DNA during transcription.

The code for the gene is transferred by mRNA to the ribosome for protein production to begin.

Proteins are constructed from a polypeptide chain of amino acids.  

Once the polypeptide chain is constructed, a protein is produced and the trait can be expressed.

the answer is: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall.

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