Chapter 18, Problem 11TYU

draw it The diagram below shows five genes, including their enhancers, from the genome of a certain species. Imagine that yellow, blue, green, black, red, and purple activator proteins exist that can bind to the appropriately color-coded control elements in the enhancers of these genes.

(a) Draw an X above enhancer elements (of all the genes) that would have activators bound in a cell in which only gene 5 is transcribed. Identify which colored activators would be present.

1. (b) Draw a dot above all enhancer elements that would have activators bound in a cell in which the green, blue, and yellow activators are present. Identify which gene(s) would be transcribed.
2. (c) Imagine that genes 1,2, and 4 code for nerve-specific proteins, and genes 3 and 5 are skin specific. Identify which activators would have to be present in each cell type to ensure transcription of the appropriate genes.