Imagine a species of sparrow that lives on a tropical island and feeds on you co

Question

Imagine a species of sparrow that lives on a tropical island and feeds on you collected of the beak widths of a small population of these birds prior to their mating season. ID Beak width (cm 1 1.2 2 2.1 3 2.5 z.1 2. S 5 1.9 7 0.8 8 2.1 9 2.2 10 1.6 x 11 1.8 12 2 13 1.3x 14 1.8 yx 15 1.7 t2.3 A very wet spring led to the production of exceptionally large seeds in their food plant and as a result all birds with large beaks (2.0 cm or larger) ate like kings and survived. All other birds died. 22. What is the selection differential on beak width from the wet spring event and elimination of smaller seeds? A. 1.80 ?.-0.50 C. 2.32 D. -0.34 0.52

Explanation / Answer

Selection Differential = Mean of the total population - Mean of the individuals which reproduce

Mean of total population = (1.2 + 2.1 + 2.5 + 3 + 1.9 + 1 + 0.8 + 2.1 + 2.2 + 1.6 + 1.8 + 2 + 1.3 + 1.8 + 1.7)/15 = 27/15 = 1.8

Mean of the individuals which reproduce = Mean of values 2cm or larger = (2.1 + 2.5 + 3 + 2.1 + 2.2 + 2)/6 = 2.32

Therefore selection differential = 1.8 - 2.32 = -0.52

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