Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 12, Problem 3NST
If a human nucleus is 10 μm in diameter, and it must hold as much as 2 m of DNA, which is complexed into nucleosomes that during full extension are 11 nm in diameter, what percentage of the volume of the nucleus is occupied by the genetic material?
HINT: This problem asks you to make some numerical calculations in order to see just how “filled” the eukaryotic nucleus is with a diploid amount of DNA. The key to its solution is the use of the formula V = (4/3)πr3, which calculates the volume of a sphere.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
If a human nucleus is 10 mm in diameter, and it must hold as much as 2 m of DNA, which is complexed into nucleosomes that during full extension are 11 nm in diameter, what percentage of the volume of the nucleus does the genetic material occupy?
A human chromosome (During Mitosis) is 4 µm long but contains 16 mm of DNA. What is the packing ratio?
A group of cells is assayed for DNA content immediately following mitosis and is found to have an
average of 20 picograms of DNA per nucleus. Approximately how many picograms of DNA would
be found in a nucleus at prophase of mitosis?
Chapter 12 Solutions
Concepts of Genetics (12th Edition)
Ch. 12 - In bacteriophages and bacteria, the DNA is almost...Ch. 12 - After salivary gland cells from Drosophila are...Ch. 12 - If a human nucleus is 10 m in diameter, and it...Ch. 12 - Roberts syndrome is a rare inherited disorder...Ch. 12 - Prob. 2CSCh. 12 - Roberts syndrome is a rare inherited disorder...Ch. 12 - HOW DO WE KNOW? In this chapter, we focused on how...Ch. 12 - CONCEPT QUESTION Review the Chapter Concepts list...Ch. 12 - Contrast the size of the single chromosome in...Ch. 12 - Describe the structure of giant polytene...
Ch. 12 - What genetic process is occurring in a puff of a...Ch. 12 - During what genetic process are lampbrush...Ch. 12 - Why might we predict that the organization of...Ch. 12 - Describe the sequence of research findings that...Ch. 12 - Describe the molecular composition and arrangement...Ch. 12 - Describe the transitions that occur as nucleosomes...Ch. 12 - Provide a comprehensive definition of...Ch. 12 - Mammals contain a diploid genome consisting of at...Ch. 12 - Assume that a viral DNA molecule is a 50-m-long...Ch. 12 - How many base pairs are in a molecule of phage T2...Ch. 12 - Examples of histone modifications are acetylation...Ch. 12 - Contrast the structure of SINE and LINE DNA...Ch. 12 - Variable number tandem repeats (VNTRs) are...Ch. 12 - It has been shown that infectious agents such as...Ch. 12 - Cancer can be defined as an abnormal proliferation...Ch. 12 - In a study of Drosophila, two normally active...Ch. 12 - Prob. 21ESPCh. 12 - An article entitled Nucleosome Positioning at the...Ch. 12 - Prob. 23ESPCh. 12 - Following is a diagram of the general structure of...Ch. 12 - Microsatellites are currently exploited as markers...Ch. 12 - At the end of the short arm of human chromosome 16...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Suppose cells in an experiment had been labeled with green fluorescent tubulin. At the onset of Anaphase B, you use your laser to bleach a stripe across all of the microtubules on one side of the spindle as shown by the dashed line. This does not hurt the function of the microtubules in any way, but the bleached, nonfluorescent subunits in the microtubules now serve to mark a fixed location relative to the (+) and (-) ends. pl. membr. spindle A. Label one of each of the following: kinetochore MT, astral MT, polar MT. Indicate (+) and (-) ends. B. As the cell progresses through anaphase B, do the bleached spots get closer to, further from, or stay the same distance from the spindle pole they are embedded in? Why? Do they get closer to, further from, or stay the same distance from the plasma membrane? Why?arrow_forwardA previously undiscovered single-cell organism was found living at a great depth on the ocean floor. Its nucleus contained only a single linear chromosome with 7 x 106 nucleotide pairs of DNA coalesced with three types of histone-like proteins. Consider the following questions: Question: The analysis of individual nucleosomes reveals that each unit contained one copy of each protein and that the shortlinker DNA contained no protein bound to it. If the entirechromosome consists of nucleosomes (discounting any linkerDNA), how many are there, and how many total proteins areneeded to form them?arrow_forwardBiologists have long been interested in the effects of radiation on cells. In one experiment, researchers examined the effect of radium on mitosis of chick embryo cells growing in culture. A population of experimental cells was examined under the microscope for the number of cells in telophase (as a measure of mitosis occurring) before, during, and after exposure to radium. The results are shown in the Figure. What is the effect of radium exposure on mitosis? Source: R. G. Canti and M. Donaldson. 1926. The effect of radium on mitosis in vitro. Proceedings of the Royal Society of London, Series B, Containing Papers of a Biological Character 100:413419.arrow_forward
- Discuss the levels of chromosomal organization with reference to the following terms: a. nucleotide b. DNA double helix c. histones d. nucleosomes e. chromatinarrow_forwardWhat difference exists between the compaction of chromosomes during metaphase versus interphase? Give at least one reason why this difference may be necessary.arrow_forwardConsider the figure beow, which depicts chromatin within the neucleus of a eukaryotic cell. nucleus O The letter A indicates regions of a single chromosome which are not expressed, and the letter B indicates regions of a single chromosome which are expressed. O Both answer choice A and answer choice B are correct. The letter A indicates regions of a single chromosome which are condensed and attached to the nuclear lamina, and the letter B indicates regions of a single chromosome which are partially decondensed. O Answer choices A, B and C are all correct. O The letter A represents repressed TADS, and the letter B represents active TADS.arrow_forward
- Consider the following DNA molecule (shown in the picture) and assume this is the DNA sequence of the entire chromosomes. list the amino acid sequences of the possible protein or proteins that could be produced from this DNA sequence what would be the DNA sequence of a sister chromatid generated from this chromosome sequence? (specify the 5' nd 3' ends)arrow_forwardWhich of the following statements regarding DNA synthesis at the ends of linear chromosomes is true?arrow_forwardAnswer the following four questions about DNA and chromosomes. (Hint: there may be slightly different numbers for these values-write the best one you know).What percentage of the human genome is made up of repetitive DNA? %What is the diameter of the chromatin fiber known as "beads on a string"? nmHow many histone proteins total assemble to make up a nucleosome? If a double stranded DNA has 22 percent adenine, what percent is guanine? %arrow_forward
- (a) What is the centrosome? (b) Cytoskeletal elements play important roles in cell division. The mitotic spindle apparatus is made up of and pulls sister chromatids apart, whereas the contractile ring is made up of required for the separation of daughter cells at the end of the mitotic phase of the cell cycle. Question 8 Diagrammatically show metaphase and telophase of mitosis using a cell that is 2n=2 which has one metacentric chromosome and one telocentric chromosome.arrow_forwardIn the tracking chromosomal DNA movement through mitosis experiment, how many chromosomes did each of your daughter cells contain? Why is it important for each daughter cell to contain information identical to the parent cell? How often do human skin cells divide? Why might that be? Compare this rate to how frequently human neurons divide. What do you notice?arrow_forwardA small amount if cytoplasm isolated from a mitotic cell is injected into an unfertilized frog oocyte, causing the oocyte to enter M phase. A sample of the injected cytoplasm is then taken and injected into a second oocyte, causing this cell also to enter the M phase. this process is repeated many times until essentially, none of the original protein samples remains, and yet, cytoplasm taken from the last in the series on injected oocytes is still able to trigger entry into the M phase with undiminished efficiency. Explain this remarkable observation.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage LearningHuman Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning
DNA vs RNA (Updated); Author: Amoeba Sisters;https://www.youtube.com/watch?v=JQByjprj_mA;License: Standard youtube license