PSY 3061 Chapter Notes - Chapter 2: Methyl Group, Messenger Rna, Human Genome Project
Document Summary
What darwin didn"t understand: how members of the same species are different from each other, how characteristics are passed from generation to generation. Gregor mendel had sent him the answers but was not recognized as significant until the early 20th century, after their deaths. Mendel"s experiments on pea plant genetics: he studied dichotomous traits. Dichotomous traits: occur in one form or another, never both. In pea plants: seed color (brown or white: he used true-breeding lines. True-breeding lines: always produce offspring with the same trait when interbred, even after many generations. Crossed true-bred brown seed line with true-bred white seed line o. Second-generation offspring: 75% brown seeds, 25% white seeds. Dominant trait: appears in 100% of first-generation offspring (brown seeds, brown eyes) Recessive trait: appears in 25% of second-generation offspring (white seeds, blue eyes) Genotype: traits that can be passed on to offspring through genetics. Four ideas of mendel"s theory: o o.
