Material Detail

This is the fifth module in "DNA from the Beginning". "DNA from the Beginning" is an animated tutorial on DNA, genes and heredity. The science behind each concept is explained using animations, an image gallery, video interviews, problems, biographies, and links. This module introduces the use of Punnet squares to calculate the ratios of genotypes and phenotypes in hybrid crosses, using an example of a monohybrid cross producing mendel's classic 3 to 1 ratio. The gallery has pictures of Punnet anbd Bateson along with copies of some of Bateson's letters discussing hybrid crosses and the ratios produced, there are some audio files of Robert Olby discussing statistical aspects of Mendel's results and whether they were too "perfect." The biography section has background on Punnet and Bateson. There is also a well designed question about the ratios in a dihybrid cross that extends the principles already discussed.

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