8. Imagine that you collected individuals of a species of hydra and established six replicate populations in your lab at home. In the wild, this species carries a few bacterial parasites, but after creating your six populations, you treat each with antibiotics, and eliminate all bacterial parasites. At every fifth generation, you record rates of outcrossing in each population, and plot your data below: (7) 10 15 30 Generation a. Describe what happened to the rate of outcrossing over time. b. Explain two advantages to changing rates of sexual reproduction in this direction. c. Imagine that you reintroduce bacterial parasites to each population in generation 30. Predict how outcrossing rates will change by extending the x-axis, above, and plotting outcrossing rates for generations 35 – 45. Outcrossing Rate 0.2 0.4 0.6 0.8 20 25

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