The difference in temperature preference between two populations of Daphnia water fleas is due to a mutation. The original population prefers temperatures near 20°C, while the mutant population prefers temperatures between 25°C and 30°C. Predict how natural selection might affect the geographical distribution of these two populations.
What will be an ideal response?
Answers may vary. These populations prefer different temperatures. They may be ecologically isolated over time and could even evolve into two separate species. The mutant population may migrate to warmer waters, while the cool water populations will live in cooler water. The mutation could also lead to Daphnia occupying temperature-stratified habitats, with the cool water population living closer to the surface in the cooler month, and the warm water population living closer to the surface in warmer months.
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What will be an ideal response?