What would be the phenotype of embryos produced by a Drosoph

What would be the phenotype of embryos produced by a Drosophila female that carries a bicoid transgene in which the regular 3’ UTR of the bicoid gene was replaced with the 3’ UTR of hunchback? No normal bicoid gene is expressed in these embryos, just this unusual hybrid/chimeric bicoid gene. Support your answer.

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Solution

Bicoid and Hunchback are the maternal effect genes that are most important for patterning of anterior parts (head and thorax) of the Drosophila embryo.

3\'UTR are the regions where mRNA immediately follows the translation termination codon. If the 3\'UTR of bicoid is replaced with 3\'UTR of huntchback it will affect the termination of translation of Bicoid gene product and somehow it will affect the stability of the gene product.

if the bicoid gene expression is altered then the head and thoracic structures will be converted to the abdomen and there will not be any anterier structure and only posterior structure will be there at both the ends which will generate a lethal phenotype.