Q2. A medium ground finch's ability to survive often depends on its beak size primarily because: Birds with bigger beaks are socially dominant and therefore get the best nest sites. Beak size determines which seeds a finch can eat and how efficiently it can eat them. Longer beaks make better weapons, which the birds use to defend themselves against predators. Larger-beaked finches experience higher mating success. Submit Q3. Which statement best describes the pattern of natural selection on beak size? • Deep beaks are favored in dry years, while shallow beaks are favored in wet years. Selection favors birds with bigger beaks. Selection favors birds with smaller beaks. Shallow beaks are favored in large populations, while deep beaks are favored in small populations. Q4. What can happen to our virtual finch population if the environment changes from wet conditions to dry conditions (or vice versa) too ri The mutation rate may fall to zero.
Added by Anne G.
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Sri K.
How did the drought lead to an increase in beak size in the medium ground finch population? The Grants reasoned that prior to the drought, the finch population fed primarily on small seeds that they could open easily. Although larger, tougher seeds were available, they were not typically eaten, not even by finches with larger beaks. during the drought, only a limited number of small seeds were produced, leaving mostly larger, tougher seeds available for food. Finches that were unable to eat the larger seeds died of starvation. Based on their observations and the data they collected, the Grants concluded that evolution by natural selection had occurred in the medium ground finch population. The increase in the average beak size of the offspring was a direct result of the change in the food supply during the drought. In order to have reached this conclusion, the Grants must have either assumed or proven that several other facts about the finch population were true. Which statements represent information that must be true in order for the Grants conclusion to be correct? Select the three statements that must be true. Beak size varies among the birds in the finch population under study. Birds that could eat larger, tougher seeds survived and reproduced during the drought. An individual finch's beak size can change depending on the size of the seeds eats. The drought caused a mutation that led to larger beak sizes in the finch population. Beak size is an inherited trait in the finch population under study.
Jakob W.
Select one: a. finches with larger beak sizes were better adapted to able to obtain food more easily, producing a greater proportion of offspring with longer beaks. b. the drought is causing the number of finches to decrease. c. finches with smaller beak sizes were better adapted to able to obtain food more easily, producing a larger proportion of offspring with smaller beaks. d. a mutation is causing finches to grow larger beaks.
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