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common-ancestors

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Journal Articles
The American Biology Teacher. 2016; 783241–247 doi: https://doi.org/10.1525/abt.2016.78.3.241
Published: 01 March 2016
... phylogeny, students will not be concerned with recovering the correct topology. Character coding is the aim of the exercise. After the character matrix is completed, a phylogenetic tree is drawn and the students interpret the evolution of a single character, starting from the common ancestor, based on the...
Journal Articles
The American Biology Teacher. 2016; 78124–33 doi: https://doi.org/10.1525/abt.2016.78.1.24
Published: 01 January 2016
...Cristina Sousa The common ancestor and evolution by natural selection, concepts introduced by Charles Darwin, constitute the central core of biology research and education. However, students generally struggle to understand these concepts and commonly form misconceptions about them. To help...
Journal Articles
The American Biology Teacher. 2015; 773198–204 doi: https://doi.org/10.1525/abt.2015.77.3.8
Published: 01 March 2015
... of “common ancestor.” These skills can then be applied to a true biological cladogram. Figure 4. Questions to accompany Model 3. Figure 4. Questions to accompany Model 3. Figure 5. Possible target answers for this activity. Figure 5. Possible target answers for this activity...
Journal Articles
The American Biology Teacher. 2012; 74274–80 doi: https://doi.org/10.1525/abt.2012.74.2.3
Published: 01 February 2012
... evidence. We also provide references they can use to further students' understanding of human evolution and evolution in general. In the process, we highlight recent discoveries in paleontology, molecular evolution, and comparative genomics. Modern chimps and humans shared a now extinct common ancestor...
Journal Articles
The American Biology Teacher. 2020; 823181 doi: https://doi.org/10.1525/abt.2020.82.3.181
Published: 01 March 2020
... repackage the current state of the art in a format accessible to even the youngest readers. Baby Loves Green Energy! , by Ruth Spiro, is an accurate, endearing board book; Grandmother Fish , by Jonathan Tweet and Karen Lewis, depicts evolution through the progression of most recent common ancestors that...
Journal Articles
The American Biology Teacher. 2020; 82269 doi: https://doi.org/10.1525/abt.2020.82.2.69
Published: 01 February 2020
... – that all living things share a common ancestor – and says, rightly, that multiple scientific disciplines provide extensive empirical support for it. Second, addressing those teachers who imply that teaching evolution is a necessary evil, something to understand only because it is required by the...
Journal Articles
The American Biology Teacher. 2020; 822104–112 doi: https://doi.org/10.1525/abt.2020.82.2.104
Published: 01 February 2020
..., regardless of how life originated. Humans came from monkeys. We share a common ancestor with other primates (i.e., monkeys and apes). Evolution and natural selection are goal-oriented. Natural selection is the result of variation, reproductive success (or failure), and heredity. It has no goal and is...
Journal Articles
The American Biology Teacher. 2019; 818533 doi: https://doi.org/10.1525/abt.2019.81.8.533
Published: 01 October 2019
... about human uniqueness, pushing them past human exceptionalism to recognize Homo sapiens as one of millions of species in Earth's ecosystem. One of Darwin's two main questions was how species are related to each other. His answer was that all organisms have common ancestors. This is the foundation...
Journal Articles
The American Biology Teacher. 2019; 818599–604 doi: https://doi.org/10.1525/abt.2019.81.8.599
Published: 01 October 2019
...: hence, evolution. That would surely explain the similarities and differences in striping among the various zebra types in Africa ( Figure 8 ), along with the now extinct quagga ( Figure 13 ): they all reflect pattern changes from some common ancestor ( Leonard, 2005 ; Larison, 2012 ). Ultimately, the...
Journal Articles
The American Biology Teacher. 2019; 817474–478 doi: https://doi.org/10.1525/abt.2019.81.7.474
Published: 01 September 2019
... cover a much larger area. (p. 4) The more genes individuals have in common, the greater the evolutionary payoff of cooperating. One's own fitness – that is, the number of one's own genes that make it into the next generation – includes the fitness of close relatives. Fitness is inclusive of...
Journal Articles
The American Biology Teacher. 2019; 816417–422 doi: https://doi.org/10.1525/abt.2019.81.6.417
Published: 01 August 2019
... species of the pair. The students are prompted by Worksheet 3 to consider performing some basic calculations for ascertaining patterns in the data. Students can calculate means of branch length ratios (distance from common ancestors for the tropical species vs. distance from the common ancestors for the...
Includes: Supplementary data
Journal Articles
The American Biology Teacher. 2019; 815378–379 doi: https://doi.org/10.1525/abt.2019.81.5.378
Published: 01 May 2019
... past. Contrary to earlier views, the mixture of distinct populations has been a common event in our species' history, and these events are discussed in greater detail throughout the book. Each of the chapters in sections 1 and 2 begins with a timeline that provides an overview of the period discussed...
Journal Articles
The American Biology Teacher. 2019; 813145 doi: https://doi.org/10.1525/abt.2019.81.3.145
Published: 01 March 2019
..., it speaks to our heritage in our own tiny corner of the universe. It allows us to reflect on our role in the chapter that is currently being written. Help students understand what it means to be human and how our humanity is linked to all living things. Humans have a common ancestor at many levels...
Journal Articles
The American Biology Teacher. 2019; 812120–125 doi: https://doi.org/10.1525/abt.2019.81.2.120
Published: 01 February 2019
.... Similarly, not all images change evenly, often depending on the level of excitement you've managed to generate in the class regarding the images ( Figure 1C ). In that case, the teacher can also emphasize that not all species evolve. Many are still very similar to the original common ancestor while other...
Journal Articles
The American Biology Teacher. 2019; 81279–87 doi: https://doi.org/10.1525/abt.2019.81.2.79
Published: 01 February 2019
... common ancestor more than 3.5 billion years ago; it then branched out over time, generating many new and diverse species reflected in the phylogeny of life ( Coyne, 2009 ). The history of life has always been influenced by the history of the Earth 3 . Fossils (remains or evidence of life >5000 years...
Journal Articles
The American Biology Teacher. 2018; 808557–559 doi: https://doi.org/10.1525/abt.2018.80.8.557
Published: 01 October 2018
... and Middle-earth! And what do all of these people have in common? Science is their superpower. People are drawn to stories for more than entertainment. Robert McKee, a master storyteller and guru to legions of Hollywood screenwriters, points out that stories fulfill “the profound human need to...
Journal Articles
The American Biology Teacher. 2018; 808561–569 doi: https://doi.org/10.1525/abt.2018.80.8.561
Published: 01 October 2018
... genetic modifications cause giraffe neck vertebrae to lengthen, in comparison to their ancestors, during embryogenesis?” This approach allows us to investigate a wide variety of previously less tractable problems, including changes in developmental gene regulation ( Carroll, 2008 ), the origin of...
Journal Articles
The American Biology Teacher. 2018; 806446–450 doi: https://doi.org/10.1525/abt.2018.80.6.446
Published: 01 August 2018
..., as members of each group are assumed to have descended from a common ancestor. Thus, full comprehension of this system requires both a basic understanding of evolutionary thought as well as a thorough knowledge of vocabulary for that specific field. This leaves phenetic classification, termed...
Images
Sample activity for students based on the primate tree. You can add your ow...
Published: 01 March 2016
Figure 2. Sample activity for students based on the primate tree. You can add your own questions. Students can be given a table that lists organisms only and be asked to fill in the time of the most recent common ancestor. Other combinations of organisms can be used, and you can write additional Figure 2. Sample activity for students based on the primate tree. You can add your own questions. Students can be given a table that lists organisms only and be asked to fill in the time of the most recent common ancestor. Other combinations of organisms can be used, and you can write additional More
Images
Simplified phylogenetic tree of three ratites and their most recent <b>common</b> ...
Published: 01 January 2016
Figure 3. Simplified phylogenetic tree of three ratites and their most recent common ancestor (“species x”). Maps show the current geographic distribution of native populations: (a) Rhea pennata , (b) R. americana (synonym of Pterocnemia pennata ), and (c) Struthio camelus . Sources Figure 3. Simplified phylogenetic tree of three ratites and their most recent common ancestor (“species x”). Maps show the current geographic distribution of native populations: (a) Rhea pennata , (b) R. americana (synonym of Pterocnemia pennata ), and (c) Struthio camelus . Sources More