These images from the Smithsonian Institution depict Nancy Knowlton's work with snapping shrimp in Panama. Knowlton found that the closing of the isthmus -- dividing the Pacific Ocean from the Caribbean -- resulted in new species of shrimp. ***Access to Teacher's Domain content now requires free login to PBS Learning Media.
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This annotated slideshow adapted from KET's Electronic Field Trip to the Forest illustrates how blight decimated the American chestnut tree and the methods scientists use to identify and pollinate the remaining trees to create blight-resistant trees. ***Access to Teacher's Domain content now requires free login to PBS Learning Media.
Most of the major categories of adaptive behavior can be seen in all animals. This course begins with the evolution of behavior, the driver of nervous system evolution, reviewed using concepts developed in ethology, sociobiology, other comparative studies, and in studies of brain evolution. The roles of various types of plasticity are considered, as well as foraging and feeding, defensive and aggressive behavior, courtship and reproduction, migration and navigation, social activities and communication, with contributions of inherited patterns and cognitive abilities. Both field and laboratory based studies are reviewed; and finally, human behavior is considered within the context of primate studies.
Meiosis is important in assuring genetic diversity in sexual reproduction. Use this interactive animation to follow Meiosis I (reduction division) and Meiosis II in a continuous sequence or stop at any stage and review critical events.
This animation demonstrates the stages of mitosis in an animal cell. Use the control buttons in the upper left to run the complete animation. Click on any intermediate stage (for example, Anaphase), and see a representative still frame.
This class examines how anthropology and speculative fiction (SF) each explore ideas about culture and society, technology, morality, and life in "other" worlds. We investigate this convergence of interest through analysis of SF in print, film, and other media. Concepts include traditional and contemporary anthropological topics, including first contact; gift exchange; gender, marriage, and kinship; law, morality, and cultural relativism; religion; race and embodiment; politics, violence, and war; medicine, healing, and consciousness; technology and environment. Thematic questions addressed in the class include: what is an alien? What is "the human"? Could SF be possible without anthropology?
This video segment explores the benefits and pitfalls of cloning as a means of reproduction. From Evolution: "Why Sex?" ***Access to Teacher's Domain content now requires free login to PBS Learning Media.
- Life Science
- Material Type:
- PBS LearningMedia
- Provider Set:
- PBS Learning Media: Multimedia Resources for the Classroom and Professional Development
- Teachers' Domain
- Clear Blue Sky Productions
- National Science Foundation
- WGBH Educational Foundation
- Date Added:
Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.
By the end of this section, you will be able to:Describe advantages and disadvantages of asexual and sexual reproductionDiscuss asexual reproduction methodsDiscuss sexual reproduction methods
By the end of this section, you will be able to:Define species and describe how species are identified as differentDescribe genetic variables that lead to speciationIdentify prezygotic and postzygotic reproductive barriersExplain allopatric and sympatric speciationDescribe adaptive radiation
In this course, you will learn the basics of plant biology. The student will begin with plant anatomy, learning the names and functions of all of the parts of a plant, then move on to plant physiology, where you will learn about photosynthesis, growth, and reproduction. Next, the student will study plant evolution according to the fossil record and examine the diversity of plant life in existence today and how that diversity impacts global ecology. Upon successful completion of this course, the student will be able to: identify and describe the functions of the different cells, tissues, and organs that make up a plant; describe the major life processes in plants (photosynthesis, respiration, transpiration, growth and development, and reproduction) at the tissue, organ, cellular, and molecular level; explain the history and evolution of plants on earth; discuss plant diversity and identify the major characteristics of plant phylogenetic divisions; explain how plants fit into the global ecological system and why they are essential for life on earth. (Biology 306)
During development from stem to fully differentiated, cells in the body alternately divide (mitosis) and "appear" to be resting (interphase). This sequence of activities exhibited by cells is called the cell cycle. Watch this animation to learn more about each of the stages in the cell cycle: interphase, gap 0, gap 1, S Phase, gap 2, and M phase.
Robert Sandler tells the story of doliolid reproduction. The video was made with paper puppets and hand-drawn animations. Robert made this episode with support from the Society of Royce Fellows.
Watch the dance of development as a zebrafish egg divides and differentiates on its way to becoming an embryo in this interactive activity adapted from the Exploratorium. ***Access to Teacher's Domain content now requires free login to PBS Learning Media.
In this series of guided inquiry activities, students explore how organisms adapt to their environments through changes in their genetic codes. The learner will: create make-believe creatures and environments that have specific characteristics; rate the success of each creature in a randomly assigned environment by examining which of the creature's characteristics help, hinder, or have no effect on the creature's success in each environment; write the genetic code for their creatures from a list of fictitious genetic codes; apply his/her knowledge of genetic codes and environments to engineer new creatures that could survive in various extreme environments within our solar system.
This video segment from the Science and Technology Chat series focuses on dolphin pregnancy, birth, and care of the young, and features Atlantic bottlenose dolphins living in captivity at the Mirage Resort Dolphin Habitat. ***Access to Teacher's Domain content now requires free login to PBS Learning Media.