ASU BIO 182 Exam 2 Questions And Answers

ASU BIO 182 Exam 2 Questions And Answers Head in the Clouds Giraffes are the tallest animals on land. An adult giraffe has a neck that exceeds 2 m in length. This neck enables a giraffe to access food that other animals cannot reach and detect predators from a long distance. Studies have shown that giraffes will browse trees at heights that other herbivores cannot reach. The water and nutrients gained from leaves enhance a giraffe's fitness by increasing survival and reproduction. However, a long neck comes with a cost: the heart must spend more energy to pump blood to the brain. If a giraffe's neck were too long, the energy required to circulate blood would exceed the energy gained from eating leaves. 1. In a population of giraffes, the average length of the neck is under directional selection. - ANS False Over many generations, the average length of necks in a giraffe population will increase indefinitely. - ANS False The relationship between a giraffe's neck length and its fitness would be better described by a quadratic equation (y = ax^2 + bx + c) than a linear equation (y = ax + b). - ANS True Natural selection would reduce the variation in neck length in a population of giraffes. - ANS True In the absence of mutation, the heritability of neck length in a population of giraffes would remain the same. - ANS False Puddle Ponds