1. If the gene above is transcribed into a functional mRNA, a.) how many codons will be carried by the functional mRNA? b.) what is the sequence of the 25th codon? c.) what is the sequence of the stop codon? 2. If the mRNA transcribed for this gene will be translated into a functional protein, a.) how many amino acids will be used to build the polypeptide chain? b.) what is the amino acid coded by the 25th codon? c.) what is the amino acid coded by the last codon? 3. If the above gene is one of the three structural genes of the lac operon that codes for the protein/ enzyme responsible for breaking lactose into two molecules of simple sugars, a.) what triggers the activation of this gene? b.) what triggers the inactivation of this gene? c.) what substance is attached to the operator region of the operon in the absence of activator? d.) what gene is responsible for the synthesis of the substance used to attach in the operator region in the absence of activator? e.) what substance is attached to the promoter region of the operon in this case?
Gene Interactions
When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.
Gene Expression
Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.
1. If the gene above is transcribed into a functional mRNA,
a.) how many codons will be carried by the functional mRNA?
b.) what is the sequence of the 25th codon?
c.) what is the sequence of the stop codon?
2. If the mRNA transcribed for this gene will be translated into a functional protein,
a.) how many amino acids will be used to build the polypeptide chain?
b.) what is the amino acid coded by the 25th codon?
c.) what is the amino acid coded by the last codon?
3. If the above gene is one of the three structural genes of the lac operon that codes for the protein/ enzyme responsible for breaking lactose into two molecules of simple sugars,
a.) what triggers the activation of this gene?
b.) what triggers the inactivation of this gene?
c.) what substance is attached to the operator region of the operon in the absence of activator?
d.) what gene is responsible for the synthesis of the substance used to attach in the operator region in the absence of activator?
e.) what substance is attached to the promoter region of the operon in this case?
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