PSY100H1 Chapter 3: Psychological Science Chapter 3
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human genome may consist of just over 20,000 genes. humans complexity may be due not simply to our possessing a large number of genes but to subtleties in how those genes are expressed and regulated. understanding how genes work should enable medical researchers, down the line, to cure various ailments by altering gene functions. the first clues to the mechanism responsible for heredity were discovered by the monk gregor. Mendel around 1866: selective breeding: strictly controlled which plants bred with which other plants, 3:1 ratio. dominant gene: a gene that is expressed in the offspring whenever it us present. recessive gene: a gene that is expressed only when it is matched with a similar gene from the other parent. mendel s experiments with cross-breeding pea blossoms resulted in purple flowers by 75% of the time and which flowers 25% of the time.
