Differential gene expression describes how... (Choose the answer the best illustrates the definition of differential gene expression.) O each cell in your body expresses only a subset of its genes. O every cell in your body expresses all its genes, but at different times. O every cell in your body expresses only a subset of its genes, but all these cells exprèss the same subset of genes. different cells in your body express different subsets of genes.

6 of 22 All cells in a given mammal carry the same genome, yet certain genes are expressed only in a particular tissue, such as in the eye, and not expressed in other tissues, such as in the liver. How is this specificity of gene expression for a particular tissue achieved? O All different cell types in the organism express all proteins equally and degrade the proteins that they don't need. O Different tissues express unique transcription factors that are bound to tissue-specific enhancer elements, thereby achieving tissue-specific gene expression. O Certain organ and tissue systems, such as the nervous system, form relatively early in the organism's embryonic life, as compared to the epidermis; it is this relative age of the tissue lineage that determines which tissue- specific genes are expressed. O Different tissues inactivate whole swaths of the genome, thereby achieving tissue-specific gene expression. O Each tissue has a unique RNA polymerase holoenzyme that achieves…

he human phenotype is regulated by epigenetic control of gene expression. Discuss the three main types of epigenetic regulation, illustrating your answer with examples of diseases arising from impairment of each of these processes

How is the expression of genes controlled at the chromosomal level?   A. DNA can synthesize extra histones as needed   B. DNA can either be condensed into heterochromatin or decondensed into euchromatin     C. DNA can be unwound into euchromatin to reduce the level of expression   D. The expression of DNA can only be controlled at the transcriptional level   E. DNA is spontaneously deleted from a chromosome if not needed