This edition: Patterns of Inheritance
Gregor Mendel’s theory of inheritance in the mid-1800s became the basis for predicting how characteristics are passed from one generation to another. Marvin Rosenberg discusses how modern-day experiments on strawberry plants carry on Mendel’s genetic theses and improve the productivity of commercially grown crops. In the animation sequences throughout the program, the Punnett Square is used to illustrate how genes are sorted in the second generation produced by two organisms. To illustrate codominance, incomplete dominance, epistasis, and polygenic inheritance, Mel Carpenter details how his selective breeding of homing pigeons makes them look like pure white doves. This also covers the concept of pedigree. Finally, Carol Kasper discusses hemophilia, a genetic disease passed from generation to generation in a sex-linked pattern of inheritance.