natural selection assignment 1


Select a trait for a plant or animal. You do not have to know the truth about how this trait evolved. You are going to apply the steps of Natural selection and demonstrate how the trait might have evolved through natural selection.


The animal is a gold fish and the trait is it’s color.

Step 1. There is variation in the trait, Color – of a species of fish some are gold colored and some are purple colored.

Step 2 Differential reproduction. – The habitat of the gold and purple fish changes. With more rains during a long period of rainy seasons the water the fish live in becomes full of sand and has a more golden hue to it. This makes the purple fish stand out more and they become more vulnerable to the threat of predators.

Step 3. Heredity – The gold colored fish survive at a greater rate and get to reproduce more. Over time the fish seem to have evolved from purple or gold varieties to just gold variety.

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