s. If you saw a difference between a bird\'s ability to obtain food based on bea
ID: 150514 • Letter: S
Question
s. If you saw a difference between a bird's ability to obtain food based on beak sha De, explain how this leads to evolution over time. (Remember that the different beak types you tested in represent birds of the same medium ground finch species. They merely show variations in beak size.) This activity simulates a variety of concepts that play an important role in the process of evolution. Name a specific 6. example from this activity simulating each concept below . Variation: .Adaptation (i.e., a beneficial trait that is heritable): Selective pressure or selecting agent (i.e., what selected for one beak type versus the othe Fitness (i.e., increased likelihood to survive and reproduce): UTHOR: Written by Jason Crean, MA, MS, Lyons Township High School, La Grange, llinois; Adapted for QCC BIO 107, Crowley and Rack ted by Sandra Blumenrath, PhD and Laura Bonetta, PhD, HHMI, and Ann Brokaw, Rocky River High School, Ohio, copyedited by LindaF iew by Jonathan Losos, PhD. Adapted for OCC, Fall 2016 LabWorksheet IMI www.biointeractive.org HUGHES MEDICAL INSTITUTEExplanation / Answer
5. The relationship between change in beak shape with respect to type of food and evolution is based on the concept of natural selection. Beaks changed as the birds developed different tastes for fruits, seeds, or insects picked from the ground or cacti. Long, pointed beaks made some of them more fit for picking seeds out of cactus fruits. Shorter, stouter beaks served best for eating seeds found on the ground. Based on the environment over a long period of time the adaptations or traits will be naturally selected. This leads to evolution oer time.
6.
1. variation: mutations take place which bring about changes in beak shape.
2. adaptation: changing environmental conditions and availability of food sources is responsible for optimal beak morphology that maximizes survival under local conditions.
3. selecting agent: the food source selected one beak type over the other
4. fitness: beak shape increase the fitness of the bird as it enables them to obtain food.
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