Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 26, Problem 3EQ
What is meant by the term cell fate? What is a cell lineage diagram? Discuss the experimental advantage of having a cell lineage diagram. What is a cell lineage?
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What are two molecular controls that trigger the onset of different stages of the cell cycle?
You are working with two different yeast cultures to study their genetics. But, you are not sure what the mating type of either of the yeast cultures is. (As a reminder, yeast mating types are either a or alpha). As a test, you mix the two cultures together and then observe them under a microscope. If this is the image that you see, what can you conclude about the mating types of the yeast? Explain your answer, including what type of cell morphology you see on this microscope slide.
To identify genes controlling the cell cycle in budding yeast, a genetic screen was carried out. In this screen, haploid yeast cells were exposed to a DNA damaging agent to introduce random mutations in the genome. By culturing cells at an elevated temperature (e.g. 37 degrees), where many mutated genes lose their function, scientists identified yeast mutants that showed growth defects and arrest at specific stages of the cell cycle (e.g. in mitosis with large buds). In this screen, mutants of the cyclin-dependent kinase were identified, but not mutants of cyclins. Explain the reason for this outcome.
Chapter 26 Solutions
Genetics: Analysis and Principles
Ch. 26.1 - Prob. 1COMQCh. 26.1 - Prob. 2COMQCh. 26.1 - Which of the following is the correct order for...Ch. 26.2 - Prob. 1COMQCh. 26.2 - Prob. 2COMQCh. 26.2 - Prob. 3COMQCh. 26.2 - Prob. 4COMQCh. 26.3 - Prob. 1COMQCh. 26.3 - Prob. 2COMQCh. 26.3 - 3. Myogenic bHLH proteins are ___________ that...
Ch. 26.4 - Prob. 1COMQCh. 26.4 - Prob. 2COMQCh. 26.5 - 1. A key event that initially determines female or...Ch. 26.5 - Prob. 2COMQCh. 26 - 1. What four types of cellular processes must...Ch. 26 - Prob. 2CONQCh. 26 - Prob. 3CONQCh. 26 - 4. Which of the following statement(s) is/are true...Ch. 26 - Discuss the morphological differences between the...Ch. 26 - Prob. 6CONQCh. 26 - Explain what a morphogen is, and describe how it...Ch. 26 - 8. What is positional information? Discuss three...Ch. 26 - Prob. 9CONQCh. 26 - Prob. 10CONQCh. 26 - 11. Describe the function of the Bicoid protein....Ch. 26 - With regard to development, what are the roles of...Ch. 26 - Discuss the role of homeotic genes in development....Ch. 26 - Describe the molecular features of the homeobox...Ch. 26 - What would you predict to be the phenotype of...Ch. 26 - Prob. 16CONQCh. 26 - If a mutation in a homeotic gene produced the...Ch. 26 - 18. Explain how loss-of-function mutations in the...Ch. 26 - What is the difference between a maternal-effect...Ch. 26 - Prob. 20CONQCh. 26 - Prob. 21CONQCh. 26 - Prob. 22CONQCh. 26 - 23. Discuss the similarities and differences...Ch. 26 - 24. What is cell differentiation? Discuss the role...Ch. 26 - Prob. 25CONQCh. 26 - What is a totipotent cell? In each of the...Ch. 26 - 27. What is a meristem? Explain the role of...Ch. 26 - Prob. 28CONQCh. 26 - Predict the phenotypic consequences of each of the...Ch. 26 - 30. Explain how alternative splicing affects sex...Ch. 26 - Prob. 1EQCh. 26 - Compare and contrast the experimental advantages...Ch. 26 - 3. What is meant by the term cell fate? What is a...Ch. 26 - 4. Explain why a cell lineage diagram is necessary...Ch. 26 - Explain the rationale behind the use of the bag of...Ch. 26 - Prob. 6EQCh. 26 - Take a look at question 2 in More Genetic TIPS...Ch. 26 - All of the homeotic genes inDrosophilahave been...Ch. 26 - Prob. 9EQCh. 26 - wo techniques commonly used to study the...Ch. 26 - Prob. 11EQCh. 26 - Prob. 12EQCh. 26 - 13. Another way to study the role of proteins...Ch. 26 - 14. Why have geneticists used reverse genetics to...Ch. 26 - Prob. 1QSDCCh. 26 - Prob. 2QSDCCh. 26 - Prob. 3QSDC
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- You isolate a cell from a yeast species (a eukaryote) where n = 8, apply a chemical that forces chromosomes to condense, and then make a karyotype. You observe a cell with 16 DNA molecules. The stage of this cell: (A) [Select] [ Select] (B) [Select] and each chromosome is made up of [Select] [Select] (C) [Select] be G1 of the cell cycle, because at that stage the cell is O [Select] and so has [Select] and each chromosome is made up of [Select] and so has [Select] be Metaphase of Mitosis, because at that stage the cell is chromosomes and so has [Select] chromatid(s). and each chromosome is made up of [Select ] chromosomes chromatid(s). ✪ be Prophase II of Meiosis, because at that stage the cell is ↑ chromosomes ? chromatid(s),arrow_forwardIn the experiment of cell fusion, when tumor cells were fused with normal cells, the initially formed tetraploid cells (or subsequently arising sub-tetraploid cells) were discovered to have lost the ability to form tumors. What is the explanation for this observation?arrow_forwarda. 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_forward
- Why is it important for each daughter cell to contain information identical to the parent cell?arrow_forwardMitotic 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_forward
- What are the three protein families that regulate the cell cycle? give an example for each:arrow_forwardAccording to the diagramming methods I use, answer the following questions for the cell below: n = Is the cell haploid or diploid? True or False? This cell could be in G1 of interphase X.arrow_forwardWhat are sister chromatids? What is the process that forms two sister chromatids from a single chromosome? Explain how this process works.arrow_forward
- a) Fluorescent probes such as DAPI are often used tostudy cells that are in the different phases of cell cycle.DAPI is a fluorescent stain that binds to DNA. The graphshows the variation in fluorescence intensity of humanskin cells that were sorted by FACs into 2 populationsbased on the amount of fluorescence.Which phase(s) of the cell cycle are population A in?Population B? Why did you pick those phases?arrow_forwardWhat role does reverse transcription play in chromosomal maintenance? Give typing answer with explanation and conclusionarrow_forwardA typical somatic cell from a badger, which is a diploid, sexually reproducing animal, contains a total of 32 chromosomes. Gametogenesis in badgers is similar to humans. What is the genome size for the badger in terms of chromosome number? How many DNA molecules would be found in a secondary oocyte before dividing? How many chromosomes would be found in a cell at metaphase? How many DNA molecules should be in a tetraploid liver cell from the badger?arrow_forward
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Cell Division - Mitosis and Meiosis - GCSE Biology (9-1); Author: Mr Exham Biology;https://www.youtube.com/watch?v=w7vp_uRA8kw;License: Standard YouTube License, CC-BY