22. (10 pt) How would you explain how polar bears got their thick coats in terms of the steps of natural selection? Step 1. Variation. How did the original population of polar bears vary? Step 2. Differential Fitness. How did the original population of polar bears differ in their ability to survive and reproduce? Step 3. Heredity. What is the important trait in the original polar bear population that could be passed to offspring?
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Step 1
In the original polar bear population, individuals exhibited small differences in the thickness and density of their fur. Some bears had slightly thicker, more insulating fur while others had thinner coats. These differences in fur characteristics were the Show more…
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Shaiju T.
There are 3 types of polar bears: ones with thick coats, ones with thin coats and ones with medium coats. It is fall, soon to be winter. The temperatures are dropping rapidly and the bears must be kept warm, or they will freeze to death. Many of the bears have had ~2 cubs each but due to the extreme temperatures, many mothers only have one cub left. Which of the following demonstrates the concept of the importance of genetic variation in natural selection? Bears have different types of coats Unequal reproductive success Female bears have too many cubs to survive. Extreme temperatures and the struggle for survival
Ripujeet P.
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