How can gene regulation account for some of the phenotypic differences between organisms with similar genes

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How can gene regulation account for some of the phenotypic differences between organisms with similar genes? -Explain how interactions between external stimuli and gene expression result in specialization of cells, tissues and organs. Include two specific examples. -In Drosophila, development occurs as a result of the sequential expression of a variety of genes. Many of these are genes for transcription factors. The basic sequence or flow of development can be outlined as shown below: - Maternal effects genes (for example, bicoid) - Gap genes - Pair-rule genes - Segment polarity genes - Homeotic genes (or homeobox, Hox, genes) - Master regulatory genes (for example, myoD) -What does each type of gene control in the development of the fruit fly? - Based on your answers to the question above, if you wanted to produce a mutation that caused profound effects (drastic effects) on the overall development of the organism, where in the sequence would you introduce the mutation? Explain your answer. - What phenotype change(s) might you see if a developing fruit fly had a mutation in a gap gene? In a segment polarity gene?

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