In this video, Salman Khan of Khan Academy introduces the principles of heredity.
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Khan Academy
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This site has a list of animations and tutorials for most biology topics. Each item in the list is linked to a site. These links are appropriate for a range of levels.
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Lone Star College Biology Tutorials
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This is a simple, but clean diagram of asexual reproduction of cells. You can clearly see chromosomes, as well as easily define the different stages.
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Mitosis
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A simple tutorial and examples of incomplete dominance and codominance crosses. Includes practice questions with answers at the bottom
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Incomplete & Codominance
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This is a great website for students just beginning to learn about meiosis. There are no ads, and the site is sharp, clean, with great diagrams and explanations.
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Meiosis Explained
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This webpage has a great simple picture of the stages of meiosis. It even shows crossing over and recombination!
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Meiosis
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An extensive online interactive resource for learning about various aspects of biology.
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Unversity of Arizona: The Biology Project
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An explanation of the various types of crosses and inheritanc patterns, including problem sets and tutorials.
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The Biology Project
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A very good tutorial on one of Mendel's classic dihybrid crosses, with two heterozygotic parents. It shows diagrams at each step, and explains the ratios of phenotypes.
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The Biology Project: Dihybrid Cross
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