Khan Academy
Khan Academy: The Baby Boom
Looks at the baby boom in America after World War II - what caused it, why it lasted so long, and the far-reaching social and economic impact it has had on the United States.
Khan Academy
Khan Academy: The Growth of Suburbia
The GI Bill made it possible for World War II veterans to finance the purchase of a house. This, combined with mass production of houses, led to the growth of suburban communities, including three Levittown suburbs.
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Khan Academy: The Dark Side of Suburbia
The suburbs were not idyllic for some. Women found the conformity of them restrictive and African Americans were usually barred from living in them.
Khan Academy
Khan Academy: Start of Cold War, Part 1: Yalta Conference and Containment
At the end of World War II, the Yalta Conference saw the splitting of Germany into four zones and the United States began a policy of containment of communism.
Khan Academy
Khan Academy: Start of Cold War, Part 2: Truman Doctrine and Marshall Plan
Explains President Truman's plan to contain communism, which signaled the end of American isolationism. Also discusses America's pledge of financial aid to rebuild Europe with the Marshall Plan.
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Khan Academy: Start of Cold War, Part 3: Berlin Airlift and Creation of Nato
Discusses the Berlin airlift, NATO, and the National Security Act.
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Khan Academy: The Reaction Quotient Q
Definition of reaction quotient Q, and how it is used to predict the direction of reaction.
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Khan Academy: Arrhenius Acids and Bases
Definition of Arrhenius acids and bases, and Arrhenius acid-base reactions.
Khan Academy
Khan Academy: P H, P Oh, and the P H Scale
Definitions of pH, pOH, and the pH scale. Practice calculating the pH of a strong acid or base solution. Learn the relationship between acid strength and the pH of a solution.
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Khan Academy: Mitosis Questions
Use these questions to check your understanding of mitosis.
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Khan Academy: Bacteria Binary Fission
Tutorial explains the steps of bacterial binary fission which is the process that bacteria use to carry out cell division.
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Khan Academy: Meiosis
In this tutorial students will learn how meiosis reduces chromosome number by half and become familiar with crossing over, meiosis I, meiosis II, and genetic variation.
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Khan Academy: Sexual Life Cycles
Tutorial takes a look at the three types of sexual life cycles used by different organisms: diploid-dominant, haploid-dominant, and alternation of generations.
Khan Academy
Khan Academy: Polygenic Inheritance and Environmental Effects
Learn about traits that are controlled by multiple genes and/or influenced by the environment. Understand penetrance and expressivity.
Khan Academy
Khan Academy: The Chromosomal Basis of Inheritance
Learn about Thomas Hunt Morgan's experiments with the fruit fly (Drosophila melanogaster) as a model system.
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Khan Academy: Aneuploidy & Chromosomal Rearrangements
Find out about aneuploidy and nondisjunction, as they relate to down syndrome and other related disorders. Also learn about chromosomal rearrangements.
Khan Academy
Khan Academy: Classic Experiments: Dna as the Genetic Material
Learn about the experiments by Frederick Griffith, Oswald Avery, Alfred Hershey, and Martha Chase that led to the discovery of DNA as the genetic material.
Khan Academy
Khan Academy: Mode of Dna Replication: Meselson Stahl Experiment
See a key historical experiment that demonstrated the semi-conservative mechanism of DNA replication.
Khan Academy
Khan Academy: Dna Proofreading and Repair
Learn about the mechanisms that work to correct errors during DNA replication and to repair DNA damage over the cell's lifetime.
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Khan Academy: Telomeres and Telomerase
See how telomeres act as protective "caps" on the tips of eukaryotic chromosomes. Also learn how telomerase extends telomeres.
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Khan Academy: Intro to Gene Expression (Central Dogma)
Learn how genes in DNA can provide instructions for proteins. Understand the central dogma of molecular biology: DNA, RNA, protein.
Khan Academy
Khan Academy: One Gene, One Enzyme
Learn about these historical experiments having to do with genes being connected to enzymes: Garrod's studies of alkaptonuria and Beadle and Tatum's work with Neurospora mutants.
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Khan Academy: Nucleic Acids
Discover the structure and function of DNA and RNA, and understand nucleotides and polynucleotides.
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Khan Academy: Overview of Transcription
Find out about the process of transcription, where the DNA sequence of a gene is transcribed to make an RNA molecule.