A genetic modification specialist modifies a gene in 150 bacterial cultures. After treatment, 30% show successful expression. Of the unsuccessful ones, 20% are retested and two-thirds show success. How many cultures failed initially but succeeded on retest?

Sat, 09 May 2026 21:45:04 +0000

Title: Unlocking Bacterial Gene Expression: Insights from a Genetic Modification Experiment In the cutting-edge field of genetic modification, precision and iterative testing play pivotal roles in achieving reliable results. A recent study featured a specialist who engineered a key gene across 150 bacterial cultures. Here’s a detailed breakdown of gene expression outcomes and what it reveals about post-modification analysis. The initial experiment involved 150 bacterial cultures where a targeted gene was introduced. Following treatment, 30% of the cultures successfully expressed the modified gene—equating to 45 successfully modified strains. This indicates a solid baseline success rate. However, 70% of the cultures (150 – 45 = 105) failed to show expression. Of these unsuccessful cases, the specialist opted to retest 20% of them—20% of 105 equals 21 cultures. Among these retested samples, two-thirds ultimately demonstrated successful gene expression.