Eukaryotes: A Genetic Analysis

For all organisms, prokaryotes and eukaryotes, they all must regulate the specific genes that are expressed at any given time (Campbell 365). Each organism continuously turn on and off genes in response to external and internal environmental signals. The regulation of gene expression is especially important in multicellular organisms since it is essential for the different types of cell to have their own cell specialization (Campbell 365). In order for each cell to do it’s given role, they each need to maintain a program of gene expression individually to have some genes expressed and the rest not (Campbell 365). Only 20% of protein coding genes that a human cell has might be expressed. Cells such as muscle and nerve cells are highly differentiated so they express an even lower percentage of their genes (Campbell 365). Most of the cells in a multicellular organism have the same …show more content…
Methylated cytosines leads to the condensation of chromatin meaning that it may cause the chromatin to be more tight and packed so it will promote gene silencing since it will not allow the chromatin to be expressed; however acetylated histones will promote transcription and thus reversing the effect of the methylated cytosine, making this choice incorrect.

C. Methylated cytosines and deacetylated histones associated with relaxed chromatin and gene expression This choice is incorrect. Once again, the methylated cytosine is shown to cause the chromatin to condense, however in this case this is not favorable since it wants the gene to be expressed. Thus, the methylated cytosine is not associated with relaxed chromatin and gene expression; and on the other hand, the acetylated histones have seen to open up the chromatin structure and promote transcription, so since this choice has deacetylated histones it does the opposite, making this choice incorrect.

D. Unmethylated cytosines and acetylated histones are associated with relaxed chromatin and gene