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Offner, Susan – American Biology Teacher, 2014
New phylogenomic tools have made it possible to construct a robust phylogenetic tree of mollusks. This tree can be used to teach important evolutionary principles.
Descriptors: Science Instruction, Teaching Methods, Animals, Genetics
Offner, Susan – American Biology Teacher, 2013
A point mutation in the MC1R gene, a G-protein-coupled receptor, has been found that could have led to the formation of two subspecies of Solomon Island flycatcher from a single ancestral population. I discuss the many roles that G-protein-coupled receptors play in vertebrate physiology and how one particular point mutation can have enormous…
Descriptors: Genetics, Science Instruction, Animals, Physiology
Offner, Susan – American Biology Teacher, 2010
The Y chromosome is of great interest to students and can be used to teach about many important biological concepts in addition to sex determination. This paper discusses mutation, recombination, mammalian sex determination, sex determination in general, and the evolution of sex determination in mammals. It includes a student activity that…
Descriptors: Biology, Teaching Methods, Genetics, Science Instruction
Baum, David A.; Offner, Susan – American Biology Teacher, 2008
Phylogenetic trees, which are depictions of the inferred evolutionary relationships among a set of species, now permeate almost all branches of biology and are appearing in increasing numbers in biology textbooks. While few state standards explicitly require knowledge of phylogenetics, most require some knowledge of evolutionary biology, and many…
Descriptors: Evolution, Textbooks, State Standards, Biology
Peer reviewed
Offner, Susan – American Biology Teacher, 1996
Presents a plain English map of the chromosomes of the fruit fly that contains genes from very different kinds of studies. Represents the work of nearly a century by thousands of researchers using a tremendous variety of techniques. (JRH)
Descriptors: Biology, DNA, Evolution, Genetics
Peer reviewed
Offner, Susan – American Biology Teacher, 2001
Presents a universal phylogenetic tree suitable for use in high school and college-level biology classrooms. Illustrates the antiquity of life and that all life is related, even if it dates back 3.5 billion years. Reflects important evolutionary relationships and provides an exciting way to learn about the history of life. (SAH)
Descriptors: Biology, Classification, Evolution, Higher Education
Peer reviewed
Offner, Susan – American Biology Teacher, 1994
Uses diagrams to aid in discussing how the English map of the human chromosomes, published by Offner in 1993, can be used to illustrate some important questions in evolution, as well as give students a glimpse into some of the mechanisms underlying evolutionary change. (ZWH)
Descriptors: Evolution, Genetics, Instructional Materials, Science Activities
Peer reviewed
Offner, Susan – American Biology Teacher, 1994
Uses diagrams to aid in discussing how the English map of the human chromosomes, published by Offner in 1993, can be used to illustrate some important questions in evolution, as well as give students a glimpse into some of the mechanisms underlying evolutionary change. (ZWH)
Descriptors: Evolution, Genetics, Instructional Materials, Science Activities