Teacher's Pet
Speciation
Darwin believed species came from other pre-existing species. Now we know it is more complicated than that. The video focuses on speciation and patterns of evolution.
Teacher's Pet
Types of Natural Selection
Natural selection—good things come to those who mate. The video introduces the idea of natural selection. Then it details three types: directional, stabilizing, and disruptive. It includes both graphs and examples for each type.
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Disruption of Genetic Equilibrium
Could a population stay the exact same over time with no change in allele frequencies? The video explains the Hardy-Weinberg equilibrium theorem and the assumptions it requires. It discusses mutation, migration, gene flow, genetic drift,...
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Allele Frequencies
One way scientists describe diversity in a population is through allele frequencies. The video explains how to perform these simple calculations. Then it presents the Hardy-Weinberg assumptions and the difference between acclimation and...
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Population Genetics
Population genetics deals with genetic differences within and between populations. The video explains why this is the lowest level of evolution. Then it discusses mutations, environmental factors, genetic recombination, and random gamete...
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Species Interactions
Every species competes for food. The video explains interspecific competition, intraspecific competition, and the competitive exclusion principle as a part of predator-prey relationships. It also covers resource partitioning and the...
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Population Dynamics
Some scientists believe the earth is already over its carrying capacity for humans. The video explains what a carrying capacity is and the limiting factors to consider. It also teaches how to calculate growth rate, interpreting growth...
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Energy Transfer in Trophic Levels
Learn more about food chains, the food web, and the concepts relating to them. It focuses on consumers, producers, decomposers, energy transfer, and energy loss across trophic levels.
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Introduction to Ecology
An educational video offers an overview of ecology and discusses the levels of organization from biosphere down to organisms. It also compares terms such as habitats versus niches, generalist versus specialist, and biotic versus abiotic.
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Pedigrees
Docturs use a pedigree analysis chart to predict genetic disorders inherited in a family. The video explains how to interpret pedigrees and how to determine dominant, recessive, and sex-linked traits.
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Non-Mendelian Genetics
Any pattern of inheritance that does not follow Mendel's laws uses non-Mendelian inheritance. The video explains this type of genetics with many guided practice problems. It covers incomplete dominance, codominance, and sex-linked traits.
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Monohybrid Cross
Heterozygoes appear just a-llele uneven. The video explains how to solve monohybrid crosses using Punnett squares. It offers many practice problems determining the allele and percentages.
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Gregor Mendel
What did Gregor Mendel say when he founded genetics? Woopea! The video introduces Gregor Mendel to viewers. It details his initial experiments with peas and his understanding of genetics.
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Mitosis and Meiosis
Use chromosomes in marketing because as you know, sex cells. The video explains both mitosis and meiosis. It focuses on both the similarities and the differences in the process of forming sperm, egg, and zygote.
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Leaf Structure Lab
Two guard cells protect every stoma on a leaf. The video explains the structures of leaves, including stomatas. It details how to identify the parts under a microscope.
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Percent Composition and Empirical Formulas
Investigate empirical formulas and their relationships to the composition of a compound. The lesson first demonstrates a percent composition calculation. It then defines an empirical formula and applies it to given masses to determine a...
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Atomic and Molar Mass
Teach the connection between isotopes and atomic mass. An engaging video demonstrates the calculation of the atomic mass of carbon when considering its isotopes. The instructor then shows the connection to molar mass.
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Dimensional Analysis
Time to discover a new dimension—dimensional analysis that is. After discussing the need for dimensional analysis, the video lesson describes the process by giving a general setup. The instructor then demonstrates examples in both...
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Measurements and Significant Figures
Are your lab results both accurate and precise? An interesting video lesson explains the difference between the two descriptions. Using error and percent error measurements, these descriptions become concrete and in turn leads to a...
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SI Units and Density
Scientists use SI units as a common language. Expose learners to the basic measures and prefixes with a video lesson. The instructor presents these concepts as well as introduces density calculations as a way to combine units.
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Factors Affecting Reaction Rates
You can speed up or slow down a reaction when you know these factors. Learners explore the factors affecting reaction rates such as catalysts and inhibitors, temperature, surface area, and concentration. The video provides examples for...
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Collision Theory
Teach the three components of the collision theory through a video lesson. The narrator explains what it takes for a reaction to occur. A perfect combination of collisions, energy, and orientation and a reaction is underway.
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Reactions in Aqueous Solutions
Chemical reactions take a dip in this lesson. Learners watch as the instructor describes the role of aqueous solutions in reactions. They learn how to write a net ionic equation by eliminating spectator ions and also explore solubility...
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Types of Chemical Reactions
How many different types of reactions can you name? After watching the video, your classes should be able to discuss five different types. The lesson explores the similarities and differences between combination, single replacement,...