The even-skipped gene is a pair-rule gene expressed in 7 stripes across the Dros
ID: 226200 • Letter: T
Question
The even-skipped gene is a pair-rule gene expressed in 7 stripes across the Drosophila embryo. If the enhancer for stripe 5 expression was placed upstream of a GFP gene and then introduced into Drosophila embryos, where would the GFP be expressed?
The even-skipped gene is a pair-rule gene expressed in 7 stripes across the Drosophila embryo. If the enhancer for stripe 5 expression was placed upstream of a GFP gene and then introduced into Drosophila embryos, where would the GFP be expressed? O In cells of the 5th stripe of even-skipped expression O In none of the cells that express even-skipped O In all cells that express even-skipped, except cells of stripe 5 n all cells that express even-skipped (all stripes) OExplanation / Answer
When an enhancer for stripe 5 expression was placed upstream of GFP gene and intoduced into Drosophila embryos, the GFP gene is expressed in all cells that express even - skipped genes except in cells expressing stripe 5. This is because, the cells expressing stripe 5 are regulated by anteriorly by Kruppel and posteriorly by giant genes. The negative regulation of stripe 5 expressing cells prevent the expression of GFP in cells expressing stripe 5. Therefore, option 3 is correct.
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