What Was the Experimental Focus of the Preliminary Genetic Screening

Multiple Choice

What was the experimental focus of the preliminary genetic screening performed by Nüsslein-Volhard and Wieschaus?

A) to evaluate the mutagenic properties of varied treatments
B) to discover the bicoid gene
C) to generate two-tailed fruit-fly embryos
D) to identify fruit flies with mutations in genes that control fruit-fly development