In a haploid fungus,a transversion arises in the coding region of a gene necessary for the production of the amino acid leucine.The transversion substitutes the last base in the codon UAC (encoding cysteine),resulting in the stop codon UAG.This substitution will most likely cause:
A)the production of a truncated (shortened)protein.
B)the production of a truncated (shortened)mRNA.
C)the production of a shortened mRNA and of a shortened protein.
D)no detectable phenotype.
E)inability to grow on medium that lacks cysteine.

Question

Quizplus · Accepted Answer

The transversion in the coding region of the gene results in a substitution of the last base in the codon UAC, which encodes for leucine, with a stop codon UAG. This will cause premature termination of the protein translation, resulting in the production of a truncated (shortened) protein.

In a Haploid Fungus,a Transversion Arises in the Coding Region