HMB265H1 Lecture Notes - Lecture 2: Pea, Pisum, Product Rule

• School: UTSG
• Department: Human Biology
• Course: HMB265H1
• Professor: Maria Papaconstantinou

Document Summary

Artificial selection: purposeful control over mating by choice of parents: e. g. , dogs, plants, etc. Previous misconceptions of heredity: one parent contributes most to an offspring"s inherited features, blended inheritance: parental traits become mixed and forever changed in offspring. Examined inheritance of clear-cut alternative forms of particular traits: e. g. , purple versus white flowers, yellow versus green peas, could distinguish and trace unambiguously the transmission of one observed characteristic - no intermediate forms. Monohybrid crosses reveal units of inheritance and the law of segregation. Isolated pure-breeding lines for several characteristics, and carried out series of matings between individuals that differed in only one trait. Parent carries one form, other parent carries alternative form, e. g. , green and yellow peas. First filial (f1) generation: all yellow peas: to see whether the green trait had disappeared entirely, or remained intact but hidden a monohybrid cross (hybrids for a single trait) was performed. Second filial generation (f2): ratio of 3 yellow to one green pea.