Concept explainers
The accompanying chromosome diagram represents a eukaryotic chromosome prepared with Giemsa stain. Indicate the heterochromatic and euchromatic regions of the chromosome, and label the chromosome’s centromeric and telomeric regions.
What term best describes the shape of this chromosome?
Do you expect the centromeric region to contain heterochromatin? Why or why not?
Why are expressed genes not found in the telomeric region of chromosomes?
Are you more likely to find the DNA sequence encoding the digestive enzyme amylase in a heterochromatic, euchromatic, centromeric or telomeric region? Explain your reasoning.
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- ● ● Illustrate the chromosome changes in interphase and mitosis using a diploid cell that is 2n=4 (two large and two small chromosomes). Label the circles as G1 and G2 stages of interphase and each phase of mitosis (in order). Draw the chromosome in each circle using the following guidelines. 1) For unreplicated chromosome draw a line (/) and for replicated chromosome draw an X. 2) For simplicity, do not indicate that the chromosomes are decondensed chromatin during interphase. 3) Skip drawing the nuclear membrane or spindle fibers, since we are focusing on the chromosomes. Label genes in the resulting daughter cells as A/a and B/b. (These letters represent genes which are at particular places along the DNA molecule. Each chromosomes can have a thousand genes but we are focusing on these two.) Ask me Qs in class if anythign on this is not clear.arrow_forwardCould you please explain simple terms how does the base sequence contained in the telomeric regions of chromosomes differ from that found elsewhere in the chromosome?arrow_forwardIn Human chromosome 11 GC content is 42%. What is the percentage of each nucleotide on chromosome 11?arrow_forward
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