If cells of an individual contain the same set of genes, how do these cells become different from each other during development?
A) Different cell type-specific regulatory elements in DNA are created during development.
B) Different cell type-specific regulatory elements in DNA are selectively lost during development.
C) Differences in extracellular signals received by each cell lead to differences in the types of regulatory proteins present in each cell.
D) Differences develop in promoter sequences that lead to different signals being produced by each type of cell.
Answer: C
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A. Transcription can produce long polycistronic mRNA that contains multiple genes in each transcript. B. Each gene of the set usually contains its own Shine-Dalgarno sequence. C. Regulation of gene expression can occur through activation or repression mechanisms. D. All of the genes in the set are controlled by a single promoter.
Describe the approach using genomics to identify genes that contribute to the variations in cognitive ability observed in humans
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