1. Factors that alter genetic equilibrium.
2. Mutations that cause change in chromosome number.
3. Cytoplasmic genetic systems.
4. In peas b = brown leaves (+ = green), w = wrinkled seeds (+ = round) and y = yellow seeds (+ = plain). A cross is made between brown leaved, wrinkled seed and yellow seeded plant with the wild type. The resultant F1 progeny is test crossed to a triple recessive. The following F2 progenies were obtained.
Green Wrinkled Plain 177
Green Round Yellow 234
Green Wrinkled Yellow 10
Green Round Plain 1443
Brown Wrinkled Yellow 930
Brown Wrinkled Plain 242
Brown Round Yellow 153
Brown Round Plain 11
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