Concept 14.4 Many human traits follow Mendelian patterns of inheritance. Whereas peas are convenient subjects for genetic research, humans are not. o The human generation time is too long, their fecundity is too low, and breeding experiments are unacceptable. Yet, humans are subject to the same rules governing inheritance as other organisms. New techniques in molecular biology have led to many breakthrough discoveries in the study of human genetics. In pedigree analysis, rather than manipulate mating patterns of people, geneticists analyze the results of matings that have already occurred. Information about the presence or absence of a particular phenotypic trait is collected from as many individuals in a family as possible, across generations. The distribution of these characters is then mapped on the family tree. o
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