Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 6, Problem 9LTB
Summary Introduction
Introduction:
Interphase is a phase which takes place before and after mitosis of the cell cycle, i.e., between two mitotic divisions. Interphase contains three different phases which are G1, S and G2.
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In a turtle species, a diploid cell in the G1 phase of the cell cycle contains 22 picograms of DNA (picogram is a measure of the total mass of the DNA present). How much DNA is present in a cell of the same species at prophase II of meiosis (prophase of the second meiotic division)?
A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. How many picograms would be found at the end of S and the end of G2?
A group of cells is assayed for DNA content immediately following mitosis and is found to have an
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Chapter 6 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 6 - Describe three ways that cancer cells differ from...Ch. 6 - Prob. 2LTBCh. 6 - A cell that begins mitosis with 46 chromosomes...Ch. 6 - The centromere is a region at which ___________....Ch. 6 - Prob. 5LTBCh. 6 - At metaphase of mitosis, ___________. the...Ch. 6 - Sister chromatids ___________. are two different...Ch. 6 - DNA polymerase ___________. attaches sister...Ch. 6 - Prob. 9LTBCh. 6 - In what ways is the cell cycle similar in plant...
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- Draw and label G1 and G2 stages of interphase and each stage of mitosis (in order) for a cell that has two large and two small chromosomes, 2n=4. For unreplicated chromosome draw a line ( / ) and for replicated chromosome draw an X. Since we are focusing on the DNA, you can skip drawing the nuclear membrane or spindle fibers. For simplicity, do not indicate that the chromosomes are decondensed chromatin during interphase. Mark and label a place on one of the large chromosomes with the dominant allele of the “A” gene and put the recessive allele “a” on the other homolog. Mark and label a place on one of the small chromosomes with allele “B” and put the recessive allele “b” on the other homolog.arrow_forward2 3 4 5 8 9 10 11 12 13 14 15 16 17 18 19 20 22 ху During which phase does cytokinesis begin? What cell parts migrate to the poles during prophase? What structure holds the two chromatids together? What is the overall purpose of mitosis? 21arrow_forward9) A diploid cell is preparing to undergo meiosis. Before the 'S' phase, the cell has 6 picograms (pg) of DNA in it. Answer the following: a) After the 'S' phase of the cell cycle what ploidy is the cell? How many picograms of DNA does it contain? b) After meiosis I, how many daughter cells are there total? What is the ploidy of each cell? How many picograms of DNA does each cell contain?arrow_forward
- a. Manually, using a pencil, draw a cell in anaphase II from an organism in which 2n = 2 and each chromosome is metacentric. b. Given that each G1 nucleus from this organism contains 16 picograms of DNA, how many picograms of chromosomal DNA would you expect in the cell shown here?arrow_forwardIn which stage(s) of the cell cycle, mitosis or meiosis do each of these processes occur (multiple stages apply to some) Crossing-over: Chromosome supercoiling: Separation of sister chromatids: DNA synthesis: Chromosome reduction from 2N to N: 4. A previously undiscovered single celled organism was found living at a great depth on the ocean floor. Its nucleus contains only a single, linear chromosome consisting of 7x10^6 nucleotide pairs of DNA coalesced with three types of histone-like proteins. The analysis of individual nucleosomes revealed that each unit contained one copy of each protein and that the short linker DNA had no protein bound to it If the entire chromosome consists of nucleosomes (discounting any linker DNA), how many are there and how many total proteins are needed to form them?arrow_forwardIn the absence of Separase, how would this affect the chromosomes dynamic during mitosis? Explain in detail. *arrow_forward
- How many chromosomes are there in each stage of mitosis in an animal like Drosophila?arrow_forward1 3 4 Here is a replication fork during S phase of the cell cycle. DNA strands are labeled 1-4. After mitosis and cytokinesis is complete, One daughter cell will have strands 18&2, another will have strands 3&4 One cell will have 1&3, the other will have 2&4 Each of the strands (1-4) will be in a different cell. All four strands will end up in the same cell, and the other cell will have the complementary strands. Both A and B are equally likely.arrow_forwardWhich of the following diagrams correctly depicts the orientation of microtubules during metaphase of mitosis? A B C OA I (-) (+) (+) (+) (+) (+) (+) (+) (+)50 (+) == (-) XX [(+) (-) E (-) J ++) (+) - (+) (-) (+) 11 15+ E (+) (-) 50 at &&05 (-) 50) (+) (-) (-) (+) (-) D E (+) (+) (+) D (-) St (+) coff (+) (-) (+) (+) (-) (-) (+) (-) (-) affere XXX (-)- (-) ++) (+) (-) (-) (-) (-) Karrow_forward
- Mitotic nondisjunction can occur, particularly in tumor cells. Assume a single nondisjunction event involving the X chromosome occurs in a cell undergoing mitosis in a human female. First, consider the daughter cell with the smaller number of chromosomes: How many total chromosomes will this cell have? How many X chromosomes will this cell have? Next, consider the daughter cell with the larger number of chromosomes: How many total chromosomes will this cell have? How many X chromosomes will this cell have?arrow_forwardIn class, we talked about flow cytometry which allows scientists to determine what stage of the cell cycle cells are in by measuring their DNA content. Draw what the graph would look like for the mutant below at a 0-time point when there are 1000 cells total, with 5000 cells in G1, 350 cells in M and G2, and 150 cells in S phase. And then a graph of 1 hour later when the cells should have competed for mitosis: → loss of function of cdc25arrow_forwardHow many chromosomes and how many chromatids in the picture??arrow_forward
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