25.1 evolutionary process and patterns

25.1 evolutionary process and patterns - 24 discussion...

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24 discussion question 25.1 The introduction basicly goes over the four different ways that allele frequency in popu- lations can be shifted. The first is Natural selection, which we all know about. . Genetic drift changes allele frequencies randomly, but it doesn’t always increase fitness Gene flow occurs when animals leave or come into the population and remove or intro- duce alleles. A mutation introduces new alleles. It can either be beneficial, detrimental, or have no ef- fect on fitness. THe chapter mentions 3 steps that biologists take to study the evolutionary processes, what’s one step?? • They use mathmatical models to predict what will happen to alleles over time in differ- ent conditions They collect data to test the predictions And then they use the results to help endangered speices, study genetics, ect. In 1908, some biologists thought that allele frequency changed because of sexual re- production, so any of the dominant alleles were going to increase in frequency, but other biologists thought that two alleles of the same gene would reach a frequency of .5. So, Hardy and Weinberg tested the hypotheses, but they studied the frequencies of al-
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25.1 evolutionary process and patterns - 24 discussion...

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