INTRO TO GEN ANALYSIS W/ACHIEVE ACCESS
12th Edition
ISBN: 9781319423865
Author: Griffiths
Publisher: MAC HIGHER
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Chapter 2, Problem 36P
Summary Introduction
To determine: The consequences of the shortening of a cell cycle for making it easy for students.
Introduction: The complete cellular division is divided into two different phases that are: interphase and the M phase. The M phase can either be mitotic or the meiotic phase. The interphase consists of the G1 phase, S phase, and G2 phase.
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Use the diagram below to figure out how each monosomy or trisomy can
a) Normal X chromosome
segregation
b) Nondisjunction in
meiosis I
c) Nondisjunction in
meiosis II
Diploid cell at start of
meiosis
Nondisjunction
First meiotic division
Second meiotic
division
Nondisjunction
00 00
00
PEARS N
develop.
Benjamin
XCummixes
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х х
XX
XX
о о
XX
1. A color-blind man married a normal woman. Their daughter, who was phenotypically normal, married
a normal man and the couple produced three children, a normal boy, a color-blind boy, and a color-blind
girl with Turner syndrome. Explain the origin of the color-blind girl with Turner syndrome.
In an attempt to simplify meiosis for the benefit of stu-dents, mad scientists develop a way of preventing premei-otic S phase and making do with having just one division,
including pairing, crossing over, and segregation. Would
this system work, and would the products of such a sys-tem differ from those of the present system?
1)Discusses why Meiosis I is referred to as reduction division and why Meiosis II is essentially like Mitosis.
2)Discusses where problems are likely to occur in Meiosis and what these problems could lead to.
Chapter 2 Solutions
INTRO TO GEN ANALYSIS W/ACHIEVE ACCESS
Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10P
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- Nondisjunction results in uneven distribution of chromosomes during meiosis. Which of the following are true during meiosis? Select all that apply When nondisjunction occurs in meiosis II, sister chromatids fail to separate When nondisjunction occurs in meiosis I, homologous chromosomes fail to separate If a cell has a diploid number of 6 (2n =6), and one pair of chromosomes experiences nondisjunction during meiosis I, then two cells will have 4 chromosomes, and two cells will have 2 chromosomes If a cell has a diploid number of 6 (2n =6), and one pair of chromosomes experiences nondisjunction during meiosis I, then two cells will have 6 chromosomes, and two cells will have nonearrow_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_forwardMeiotic nondisjunction is much more likely than mitotic nondisjunction.Based on this observation, would you conclude that meioticnondisjunction is usually due to nondisjunction during meiosisI or meiosis II? Explain your reasoning?arrow_forward
- Which statement is true of meiosis? 1)two identical cells in both divisions 2)the first division produces haploid cells and the second produces diploid cells 3)the first division produces diploid cells and the second produces haploid cells 4) the products of both meiotic divisions are haploidarrow_forwardAn individual is heterozygous for a reciprocal translocation, with the following chromosomes: A • B C D E F A • B C V W X R ST • U D E F R ST • U V W X Q. Draw a picture of these chromosomes pairing in prophase I of meiosis.arrow_forwardImagine an organism whose diploid chromosome number is 6, and draw a cell as it appears at the beginning of anaphase I of meiosis. Draw as many cells as are present at that time, and depict all the following that are present: the cell membrane, the nuclear membrane, the centrosomes, and spindle fibers, and the chromosomes. Depict any recombination that has already occurred as accurately as possible, as well as any significant event(s) that is(are) happening involving the chromosomes.arrow_forward
- As two students, who will be designated Student J and Student K, were studying together, they argued about the differences between Mitosis and Meiosis (both Meiosis I and Meiosis II). Student J maintained that it if they were looking at very good slides under the microscope and concentrated on Metaphase, it would be possible to tell the difference between the cells undergoing Mitosis, the cells undergoing Meiosis I, and the cells undergoing Meiosis II. Student K said it would be impossible to tell which nuclear division was occurring. Assume there are three unlabeled sets of very good slides of the cells of the common pea plant with one set showing Mitosis, one set showing Meiosis I, and one set showing Meiosis II. To repeat, the slides are unlabeled so the students don’t know which process is occurring in which set. However, the students know that the common pea plant has 14 total chromosomes (or 7 pairs of chromosomes). Explain carefully what Student J would be looking for at the…arrow_forwardYour textbook stated, "The random segregation into daughter nuclei that happens during the first division in meiosis can lead to a variety of possible genetic arrangements." Explain how this is the case; how this is true? Be specific.arrow_forwardA cell that has a diploid number of 24 goes through meiosis. How many chromosomes would be in each cell after Meiosis II is completed. Would these cells be haploid or diploid? How many cells would be expected at the end of Meiosis II. Explain.arrow_forward
- Construct a table similar to that in Figure 2.12 for the different stages of meiosis, giving the number of chromosomes per cell and the number of DNA molecules per cell for a cell that begins with 4 chromosomes (two homologous pairs) in G1. Include the following stages in your table: G1, S, G2, prophase I, metaphase I, anaphase I, telophase I (after cytokinesis), prophase II, metaphase II, anaphase II, and telophase II (after cytokinesis).arrow_forwardHi, I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful! Sometimes nondisjunction will occur in a parent that has normal chromosome numbers and result in an offspring that has abnormal number of chromosomes. The phenotype of the affected offspring will often allow geneticists to determine in which parent and during which division of meiosis the nondisjunction occurred. In each of the examples below, assume the parents have a normal diploid chromosome complement. EXAMPLE 1: A man with the X-linked dominant condition “brown tooth enamel” and a woman with normal tooth enamel produce a son with brown tooth enamel. Let’s call the allele for brown tooth enamel “XB” and normal tooth enamel “Xb”. In which parent did the nondisjunction occur? Explain and/or illustrate Did nondisjunction occur at meiosis I or II? Explain and/or illustrate. What sex chromosomes are in the child’s somatic cells? EXAMPLE 2: The parents in the…arrow_forwardHi, I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful! Sometimes nondisjunction will occur in a parent that has normal chromosome numbers and result in an offspring that has abnormal number of chromosomes. The phenotype of the affected offspring will often allow geneticists to determine in which parent and during which division of meiosis the nondisjunction occurred. In each of the examples below, assume the parents have a normal diploid chromosome complement. A man with the X-linked dominant condition “brown tooth enamel” and a woman with normal tooth enamel produce a son with brown tooth enamel. Let’s call the allele for brown tooth enamel “XB” and normal tooth enamel “Xb”. EXAMPLE 1: The parents in the family above produce another son, this time with two Y chromosomes and normal tooth enamel. In which parent did the nondisjunction occur? Explain and/or illustrate. Did nondisjunction occur at meiosis I or II?…arrow_forward
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