BIO120H1 Lecture 15: Lecture 15 Notes
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BIO120H1 Full Course Notes
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variation- variation among individuals in a population. heredity- progeny resemble their parents more than unrelated individuals. selection- some forms better at surviving and breeding in a given environment. genome- the entire organisms dna including both genes and non-coding regions. contains info located on chromosomes consisting of dna. Where does genetic variation come from? recombination: mutation- ultimate source of genetic variation. through independent assortment at meiosis we get enormous genetic diversity. this diversity if manifest when individuals mate and produce offspring. It is the most important source of variability as we more from one generation to the next. amount of variation you get from independent assortment is enormous relative to mutation. a stable change in dna sequence resulting in a change of genotype. occurs at very low but variable rate in all organisms. effects: neutral, deleterious, lethal, beneficial, in manu cases their fitness effects depend on environment.
