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sister-chromatids

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Journal Articles
The American Biology Teacher. 1988; 507450 doi: https://doi.org/10.2307/4448788
Published: 01 October 1988
... chromatid ex- changes in tritium labeled chromosomes. Genetics, 43, 515-529. Taylor 515 43 Genetics 1958 Therman, E. (1986). Human Chromosomes (2nd ed.). New York: Springer-Verlag. Therman 2 Human Chromosomes 1986 How-TI o-Do-It Demonstrating Sister Chromatid Exchanges Frank J...
Journal Articles
The American Biology Teacher. 2017; 794305–308 doi: https://doi.org/10.1525/abt.2017.79.4.305
Published: 01 April 2017
... crossing over among them. The model will help students to understand how homologous chromosomes occur and how crossing over is realized between homologous chromosomes whose chromatids are not sisters. The developed model is found to be an effective tool in teaching crossing over...
Journal Articles
The American Biology Teacher. 2020; 825296–305 doi: https://doi.org/10.1525/abt.2020.82.5.296
Published: 01 May 2020
... paternal chromosomes of the same kind are homologous. 100% 56% 100% 43% Homologous chromosomes are different from sister chromatids. 100% 56% 100% 86% X and Y chromosomes behave as a homologous pair. 22% 22% 20% 29% Ploidy Chromosomes may contain one or two DNA molecules, depending...
Journal Articles
The American Biology Teacher. 2019; 819610–617 doi: https://doi.org/10.1525/abt.2019.81.9.610
Published: 01 December 2019
... chromosomes pair with each other, sometimes swapping sections, and then are segregated to separate daughter cells by the spindle apparatus. HS-M 1.3 In Meiosis II, the sister chromatids are segregated to separate daughter cells. HS-M 2 Meiosis produces four haploid daughter cells, each with half of...
Journal Articles
The American Biology Teacher. 2019; 81298–109 doi: https://doi.org/10.1525/abt.2019.81.2.98
Published: 01 February 2019
... present in the hypothetical cell. For mitosis, students will be asked to form alignment along the metaphase plate. The 2 students role playing centrosomes will “rope” the sister chromatids and pull them apart to opposite poles of the cell. Students will count how many chromosomes are present in...
Includes: Supplementary data
Journal Articles
The American Biology Teacher. 2017; 796482–491 doi: https://doi.org/10.1525/abt.2017.79.6.482
Published: 01 August 2017
...) Activity wrap up and model extensions (20 minutes) Homologous pair (#21) in the gamete failed to separate during meiosis I. Sister chromatids (#21) failed to separate during meiosis II. Cohesin was not able to be broken down by separase. Three copies of chromosome 21 were made in S phase...
Journal Articles
The American Biology Teacher. 2017; 799787–791 doi: https://doi.org/10.1525/abt.2017.79.9.787
Published: 01 November 2017
...-I Signaling............................9:740-I Simulation............................2:130-I Sister chromatids............................4:305-TT Socratic seminar............................6:492-TT Species distribution............................2:153-TT Spectrophotometer...
Images
Double-Spring Model for demonstrating mitosis in the classroom. (A) Prophas...
Published: 01 April 2012
replicated chromosomes are at the equator of the cell with the springs at equal lengths. (C) Anaphase: the sister chromatids physically separate and move toward opposite poles, which is caused by the shrinkage of the springs. (D) Telophase: the chromosomes move to the poles when the springs shrink to their replicated chromosomes are at the equator of the cell with the springs at equal lengths. (C) Anaphase: the sister chromatids physically separate and move toward opposite poles, which is caused by the shrinkage of the springs. (D) Telophase: the chromosomes move to the poles when the springs shrink to their More
Journal Articles
The American Biology Teacher. 2015; 77163–67 doi: https://doi.org/10.1525/abt.2015.77.1.9
Published: 01 January 2015
.../b represent homologous pairs of chromsomes. The instructor should confirm that students have not drawn sister chromatids at this point, which students typically draw as an X. Next, ask students to draw the same cell after it has completed S phase and the DNA has been replicated. This is an...
Journal Articles
The American Biology Teacher. 2014; 76153–56 doi: https://doi.org/10.1525/abt.2014.76.1.11
Published: 01 January 2014
... blue and orange. The chromosomes on the blue sheet are the duplicated paternal chromosomes, and the ones on the orange sheet are the homologous, duplicated maternal chromosomes. The student is asked to cut the sister chromatids before modeling meiosis ( Figure 1B ). As they model the process of...
Journal Articles
The American Biology Teacher. 2012; 744266–269 doi: https://doi.org/10.1525/abt.2012.74.4.11
Published: 01 April 2012
... replicated chromosomes are at the equator of the cell with the springs at equal lengths. (C) Anaphase: the sister chromatids physically separate and move toward opposite poles, which is caused by the shrinkage of the springs. (D) Telophase: the chromosomes move to the poles when the springs shrink to their...
Journal Articles
The American Biology Teacher. 2009; 714201 doi: https://doi.org/10.2307/27669412
Published: 01 April 2009
... to spindle fibers, then what would be observed in the cell? (Select all that are true.) a. MAD would be hound to CDC20. b. Cohesin would be associated with sister chromatids. c. Ubiquitin would be attached to Securin. d. Separase would be activated. Aurora Kinase is believed to function in signaling...
Journal Articles
The American Biology Teacher. 2004; 665328 doi: https://doi.org/10.2307/4451685
Published: 01 May 2004
... mitosis and meiosis (Chinnici et al., 2004). In my opinion, however, the exercise misses an opportunity to correct a two-dimensional textbook con- vention to something closer to three-dimensional reality. If each student is a chromatid and sister chromatids are joined at the elbow, the question is how to...
Journal Articles
The American Biology Teacher. 2004; 66135–39 doi: https://doi.org/10.2307/4451614
Published: 01 January 2004
...- ed chromosome (consisting of two sister chromatids) is symbolized by linked arms between a pair of students. We labeled the tags with large, clearly distinguishable upper case letters (for dominant genes), and lower case letters (for recessive genes). For instance, one "human chromosome" had genes "F...
Journal Articles
The American Biology Teacher. 2005; 674233–238 doi: https://doi.org/10.2307/4451827
Published: 01 April 2005
...; therefore longer styled pins were preferred. Large binder clips were easily seen and securely held the duplicated ("sister chromatids") socks together. Classroom Presentation Examples I have used sock demonstrations in many different courses. The examples presented here were adapted to a variety of classes...
Journal Articles
The American Biology Teacher. 2003; 65162–64 doi: https://doi.org/10.2307/4451435
Published: 01 January 2003
... cell marked "METAPHASE 1." For the AA/aa tetrad, if the coin shows heads, the stu- dent writes AA on the left of the dividing line, and aa on the right. If the coin shows tails, aa is written on the left, and AA is written on the right, as if the tetrad were separated into sister chromatid pairs. The...
Journal Articles
The American Biology Teacher. 1999; 615366–371 doi: https://doi.org/10.2307/4450699
Published: 01 May 1999
... formed contains a complete but undu- plicated set of genetic material. This separation of sister chromatids occurs at anaphase and is preceded by align- ment of individual two-chromatid chromosomes during metaphase. Meiosis is the mechanism of nuclear division by which an organism ulti- mately produces...
Journal Articles
The American Biology Teacher. 2000; 623204–206 doi: https://doi.org/10.2307/4450874
Published: 01 March 2000
... with a cell nucleus that contains incorrectly matched sister chromatids. While each student realizes that two chromatids (chenille stems) should be connected by a centromere (piece of straw), they often use chenille stems of different color and/or length. The correct repre- sentation (i.e. two chenille...
Journal Articles
The American Biology Teacher. 2000; 625378–381 doi: https://doi.org/10.2307/4450924
Published: 01 May 2000
.... Stegink, Ph.D., is Professor of Science Educa- tion and Biology at Calvin College, Grand Rapids, Ml 49546. 378 THE AMERICAN BIOLOGY TEACHER, VOLUME 62, NO. 5, MAY 2000 d CX Figure 1. Tenth-grade students role-play sister chromatids in a cell. Together the two girls with light jerseys are a single...
Journal Articles
The American Biology Teacher. 1997; 596374 doi: https://doi.org/10.2307/4450333
Published: 01 June 1997
... desires of the individ- ual molecules or the division of a cell as a need it perceives. A few errors bothered me. Among them are these: "salt is an anion," ref- erence to sister chromatids as twin chromatids, building DNA with the backbone of sugar and phosphate then adding nitrogenous bases, chromo...