Principle of Segregation

Principle of Segregation - Principle of Segregation Mendel...

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Principle of Segregation Mendel studied the inheritance of seed shape first. A cross involving only one trait is referred to as amonohybrid cross. Mendel crossed pure-breeding (also referred to as true-breeding) smooth-seeded plants with a variety that had always produced wrinkled seeds (60 fertilizations on 15 plants). All resulting seeds were smooth. The following year, Mendel planted these seeds and allowed them to self-fertilize. He recovered 7324 seeds: 5474 smooth and 1850 wrinkled. To help with record keeping, generations were labeled and numbered. The parental generation is denoted as the P1 generation. The offspring of the P1 generation are the F1 generation (first filial). The self-fertilizing F1 generation produced the F2 generation (second filial).
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Punnett square explaining the behavior of the S and s alleles. Image from Purves et al., Life: The Science of Biology , 4th Edition, by Sinauer Associates (www.sinauer.com ) and WH Freeman (www.whfreeman.com ), used with permission.
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