AP Biology
What did we do in class today?
Warm-up: How can natural selection influence the frequency of alleles in a population?
Good examples of answers to yesterday's warm-up. Great job!: "The environment affects the survival rate depending on the trait the organism has. If the organism survives and reproduces, the traits that enable it survive is passed on, natural selection." "The environment can influence what traits are passed down due to natural selection where organisms with more beneficial traits are more likely to survive and pass down those traits." "The traits that allow organisms to survive are more likely to succeed to future generations. Environments don't introduce new traits, only provide restrictions for organisms." "Through natural selection, individuals with favorable traits are more likely to survive and reproduce in a given environment. The traits favored are traits that make an individual better adapted to its environment." "The environment does not influence which traits an organism has, but the survival and reproduction of certain organisms with certain traits is dependent upon the environment." Things to remember about natural selection: -Organisms cannot choose to adapt: they either have the adaptation/trait or they don't -Organisms cannot evolve in a single generation: evolution/adaptation occurs over several generations -Organisms do not adapt to day to day situations only average conditions. Only major changes in average conditions can drive evolution. For instance, one hot day will not make an organism better suited to live in a hot climate. However, a drought lasting several years COULD drive evolutionary change. Today: 1. Complete Hardy-Weinberg lab 2. Hardy-Weinberg practice problems with chi-square 3. Finish orange notes, start green notes HW: BLAST lab due Monday, H-W lab due Tuesday
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