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
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Chapter 2, Problem 1PDQ
In this chapter, we focused on how chromosomes are distributed during cell division, both in dividing somatic cells (mitosis) and in gamete-and spore-forming cells (meiosis). We found many opportunities to consider the methods and reasoning by which much of this information was acquired. From the explanations given in the chapter, answer the following questions.
- (a) How do we know that chromosomes exist in homologous pairs?
- (b) How do we know that
DNA replication occurs during inter-phase, not early in mitosis? - (c) How do we know that mitotic chromosomes are derived from chromatin?
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Assume that the diploid number of a certain species is four chromosomes, two large and two small (2n=4).
a) Of the following figures, which represents a 3n (triploid) cell in mitotic metaphase?
b) For each of the wrong answers from part (a) above, explain briefly why it cannot represent a triploid cell in mitotic metaphase.
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)
Chapter 2 Solutions
Concepts of Genetics (12th Edition)
Ch. 2 - With the initial appearance of the feature we call...Ch. 2 - An organism has a diploid number of 16 in a...Ch. 2 - Examine Figure 2.12, which shows oogenesis in...Ch. 2 - Over a period of two years, a man in his early 20s...Ch. 2 - Over a period of two years, a man in his early 20s...Ch. 2 - Over a period of two years, a man in his early 20s...Ch. 2 - In this chapter, we focused on how chromosomes are...Ch. 2 - Review the Chapter Concepts list on page 14. All...Ch. 2 - What role do the following cellular components...Ch. 2 - Discuss the concepts of homologous chromosomes,...
Ch. 2 - If two chromosomes of a species are the same...Ch. 2 - Describe the events that characterize each stage...Ch. 2 - How are chromosomes named on the basis of their...Ch. 2 - Contrast telophase in plant and animal mitosis.Ch. 2 - Describe the phases of the cell cycle and the...Ch. 2 - Define and discuss these terms: (a) synapsis, (b)...Ch. 2 - Contrast the genetic content and the origin of...Ch. 2 - Given the end results of the two types of...Ch. 2 - Contrast spermatogenesis and oogenesis. What is...Ch. 2 - Explain why meiosis leads to significant genetic...Ch. 2 - A diploid cell contains three pairs of homologous...Ch. 2 - Considering Problem 15, predict the number of...Ch. 2 - During oogenesis in an animal species with a...Ch. 2 - What is the probability that, in an organism with...Ch. 2 - The nuclear DNA content of a single sperm cell in...Ch. 2 - Describe the role of meiosis in the life cycle of...Ch. 2 - Contrast the chromatin fiber with the mitotic...Ch. 2 - Describe the folded-fiber model of the mitotic...Ch. 2 - Prob. 23PDQCh. 2 - If one follows 50 primary oocytes in an animal...Ch. 2 - In mitosis, what chromatid combination(s) will be...Ch. 2 - During meiosis I, assuming no crossing over, what...Ch. 2 - Are there any possible combinations present during...Ch. 2 - Draw all possible combinations of chromatids...Ch. 2 - Assume that during meiosis I none of the C...Ch. 2 - Assume that each gamete resulting from Problem 29...Ch. 2 - A species of cereal rye (Secale cereale) has a...Ch. 2 - An interesting procedure has been applied for...Ch. 2 - Assume that you were examining a first polar body...Ch. 2 - Kuliev and Verlinsky (2004) state that there was a...
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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)?arrow_forwardWhich of the following statements about homologous chromosomes is accurate? Select all that apply. A.)They are the same as sister chromatids. B.) They are genetically identical. C.) They pair during mitosis. D.) They pair during meiosis. E.) They are genetically similar.arrow_forwardWhy do eukaryotic cells need to go through the elaborate procedure of mitosis rather than simply dividing during interphase? Select as many answers as apply. 1.Daughter cells must be genetically identical to the mother cell, for homeostasis and ordered tissue growth. 2.Bivalent chromosomes must condense and be separated in an orderly fashion, to allow equal distribution of copies into daughter cells 3.Physically dividing the nucleus during interphase would likely lead to gross chromosome breakage and highly unequal assortment of genetic information into daughter cells. 4.Dividing the nucleus during interphase would have the same outcome as mitosis 5.Daughter cells must have half the number of chromosomes after mitosis than the mother cells 6.The homologous pairs of chromosomes need to be separated, to ensure copies go to the daughter cells.arrow_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_forwardHow does prohpahse in mitosis differ from prohpahse 1 in meiosis? What genetic advantage does prohpahse 1 in meiosis offer that prohpahse in mitosis does not offerarrow_forwardIs my answer are correct?arrow_forward
- Every somatic cell in a human contains 23 pairs of chromosomes. Pairs 1 to 22 are autosomes, while pair 23 are the sex chromosomes. The pairs are described as homologous chromosomes. Answer the following questions about homologous chromosomes: Where do the chromosomes that make up each pair come from? Explain how the terms homologous chromosomes and sister chromatids are different. In genetic males, there is one pair that is not homologous. Identify the pair and explain why.arrow_forwardThe following four questions refer to the picture below: 1) In meiosis, the homologous chromosomes are side by side. Are they side by side in mitosis? 2)In meiosis, each centromere has a spindle fiber attached only to one side. In mitosis, each centromere has a spindle attached to how many sides? 3) Look at what happened right after Metaphase in both processes. In mitosis, what has been separated homologous chromosomes or sister chromatids? 4) After Metaphase I in meiosis, what has been separated, homologous chromosomes or sister chromatids?arrow_forwarda) What kind of thing went wrong with these chromosomes? Give a one-word (or two-word) answer. b) What cellular process are these chromosomes going through? c) Which one of these pictures, a, b, or c, will end up with the fewest problems, and why? (C) Alternate segregation (B) Adjacent-2 segregation (A) Adjacent-1 segregation Metaphase I configuration N1 N2 N. N2 T2arrow_forward
- You are investigating two temperature-sensitive mutant cells. In one, you can inactivate shugoshin activity by raising the temperature slightly at the start of meiosis. In the other, you can similarly inactivate separase activity by raising the temperature. How would the two cells be affected by inactivating these proteins?arrow_forwardA diploid organism produces four gametes from one parent cell through the process of meiosis. Two gametes are found to have 7 chromosomes and two gametes are found to have 5 chromosomes. A) Is this the expected number of chromosomes that would be found in each gamete following a normal cycle of meiosis? If yes, explain why. If no, explain why not and describe how the gamete situation described above occurred. B) Determine the number of homologous chromosome pairs that the original parent cell contained, before meiosis began. Explain how you determined this value.arrow_forwardWhat is the final result of mitosis in a human A) nearly genetically identical 2n somatic cells B) genetically different 2n somatic cells C) nearly genetically identical 1n somatic cells D) genetically identical 2n gamete cells Which of the following statements is TRUE? A) A single, replicated chromosome with sister chromatids has two centromeres. B) A single, unreplicated chromosome has two DNA molecules. C) Sister chromatids from a single chromosome are connected at the centromere. D) Homologous chromosomes are connected at the centromere. The first gap in the cell cycle (G1) corresponds to _____. A) normal growth and cell function B) the phase in which DNA is being replicated C) the beginning of mitosis D) the phase between DNA replication and the M phase In a diploid cell from a specific species has 5 chromosome pairs, how many sister chromatids will be found in a nucleus at prophase of mitosis? (Draw it!) A) 5 B) 10 C) 20 D) 40 Consider a cell from the species above.…arrow_forward
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