What happens if an ATT sequence appears in th | vedclass

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(C) The $Lac$ operon consists of three structural genes: $Lac\, z$,$Lac\, y$,and $Lac\, a$.$Lac\, z$ codes for $\beta$-galactosidase,$Lac\, y$ codes f

Vedclass · Accepted Answer

Synthesis of $\beta$-galactosidase occurs,but permease and transacetylase synthesis stops.

Vedclass · Answer

(C) The $Lac$ operon consists of three structural genes: $Lac\, z$,$Lac\, y$,and $Lac\, a$.$Lac\, z$ codes for $\beta$-galactosidase,$Lac\, y$ codes for permease,and $Lac\, a$ codes for transacetylase.If an $ATT$ sequence appears in the template strand,it corresponds to a $UAA$ stop codon in the $mRNA$ transcript.Since $Lac\, y$ is located downstream of $Lac\, z$,a mutation (like a premature stop codon) in $Lac\, y$ will prevent the synthesis of permease.Because the $Lac$ operon is transcribed as a single polycistronic $mRNA$,a stop codon in $Lac\, y$ will also terminate the translation of the downstream gene $Lac\, a$ (transacetylase).However,$Lac\, z$ is located upstream of $Lac\, y$,so its translation remains unaffected.Therefore,$\beta$-galactosidase will be synthesized,but permease and transacetylase synthesis will stop.

What happens if an $ATT$ sequence appears in the middle of the template strand of the $Lac\, y$ gene?

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