Concept
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Rules of Probability for Mendelian Inheritance
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Role of probability in segregation of alleles and fertilization
In a genetic cross, the probability of the dominant trait being expressed is dependent upon its frequency. In this case, both parents possessed a dominant and a recessive gene for the trait of flower color. The dominant trait is expressed in 3/4 of the offspring and the recessive trait is expressed in 1/4.
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"Punnett square mendel flowers."
http://commons.wikimedia.org/wiki/File:Punnett_square_mendel_flowers.svg
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