You are interested in studying the

You are interested in studying the genetic basis of organ formation and decideto use chicken eggs as a model system. You choose 3 homeotic genes; transcription of gene A is required for ectoderm formation, transcription of B is required for endoderm formation, and transcription of gene C directs mesoderm formation. You expose chicken embryos to OxyClean and find that gene A is mutated and nonfunctional across all of the embryos. The genes regulate one another in the following fashion: gene A blocks expression of genes B and C, and gene C blocks expression of gene B. Note that in untreated embryos, all organs develop normally. Which organs could develop within the embryo? Select ALL that apply.