How does the density of protein encoding genes found on human chromosome 22 compare with the density of protein encoding genes found on chromosome 21, two similar-sized chromosomes? How do the number and density of protein encoding genes on chromosome 22 compare with that for the Y chromosome? To answer this and the next few questions, go to the Ensembl Web site: http://www.ensembl.org/ Under the heading Browse a Genome, click Human. On the left-hand side of the next page, select the icon with chromosomes (view karyotype). On the karyotype page, select chromosome 22 (chromosome summary). You will be shown a schematic of this chromosome and histograms of different gene types. At the bottom of the page is a summary of information. Calculate âaverage protein-encoding gene densityâ by dividing coding genes by chromosome length (bps). Now go to chromosome 21 by pulling down the Change Chromosome menu and selecting chromosome 21. Examine the density and total number of genes for chromosome 21. Now do the same for the Y chromosome. Which chromosome has the greatest number of (protein encoding) genes? Which has the highest density? Which has the fewest? Show your calculations.
How does the density of protein encoding genes found on human chromosome 22 compare with the density of protein encoding genes found on chromosome 21, two similar-sized chromosomes? How do the number and density of protein encoding genes on chromosome 22 compare with that for the Y chromosome? To answer this and the next few questions, go to the Ensembl Web site: http://www.ensembl.org/ Under the heading Browse a Genome, click Human. On the left-hand side of the next page, select the icon with chromosomes (view karyotype). On the karyotype page, select chromosome 22 (chromosome summary). You will be shown a schematic of this chromosome and histograms of different gene types. At the bottom of the page is a summary of information. Calculate âaverage protein-encoding gene densityâ by dividing coding genes by chromosome length (bps). Now go to chromosome 21 by pulling down the Change Chromosome menu and selecting chromosome 21. Examine the density and total number of genes for chromosome 21. Now do the same for the Y chromosome. Which chromosome has the greatest number of (protein encoding) genes? Which has the highest density? Which has the fewest? Show your calculations.
