Biology Diversity Questions

In 1977, medium ground finches on Daphne Major experienced a severe drought. The figure shows the beak depths of the initial population before the drought (red bars) and of the drought survivors (black bars). What do the data show? Select all that apply. A.More than one-half of the initial population died during the drought. B. Finches with larger beaks had a survival advantage in the 1977 drought. C. The most common beak size of the initial population was 8.8 millimeters. A very small proportion (~5%) of the initial population with this beak size survived. D. The most common beak size of the surviving population was 10.3 millimeters. A very small proportion (~5%) of the initial population with this beak size survived. A, B, and C The top figure shows beak sizes of the 1976 finch population before the drought of 1977 (red bars) and after the drought (black bars). The lower figure shows the beak sizes of the offspring of the drought survivors in 1978. What do these figures tell us? A bar chart comparing the number of birds for 9 beak depths for the offspring of the drought survivors in 1978. For the beak depths of 7.3 and 7.8 millimeters, the number of birds is approximately 2. For the beak depth of 8.3 millimeters, the number of birds is 6. For the beak depth of 8.8 millimeters, the number of birds is 22. For the beak depth of 9.3 and 9.8 millimeters, the number of birds is 35 and 37 respectively. For the beak depth of 10.3 and 10.8 millimeters, the number of birds is 20 and 17 respectively. For the beak depth of 11.3 millimeters, the number of birds is 3. A.The finches that survived the drought (black bars) had offspring with much larger beaks. B. The offspring had a smaller range of beak depths--from smallest to largest--than their parents (black bars). C. In 1978, the offspring population is larger than the initial 1976 population before the drought. D. The overall beak depths of the 1978 offspring population are larger the original 1976 population. D. The overall beak depths of the 1978 offspring population are larger the original 1976 population. The Grants witnessed strong selection during droughts in 1977 and 1985. Compare the two droughts. Select all that apply. A. Both droughts resulted in changes to food sources that favored the survival of some medium ground finches over others. B. In both droughts, large-beaked medium ground finches had the highest survival rates. C. Both droughts events provided strong natural selection on medium ground finch populations. D. In both droughts, small-beaked medium ground finches had the highest survival rates. A and C How did the Grants test their hypothesis that differences in birds' songs can keep different species of finches from breeding with one another? A. They placed stuffed female finches onto branches to see if males would respond. B. They played the songs of medium ground finches and cactus finches through a loudspeaker to see which species responded to each song. C. They observed which birds were mating with each other and listened for the songs the birds were singing. D. They recorded birds singing on the island of Daphne Major to see which type of song was sung more often by each species. B The film defines species as populations whose members don't interbreed. What keeps different Galápagos finch species from mating? Select all that apply. A. Males only court females that have a similar beak and similar size. B. Geographic isolation and different environments led to changes in traits that affected mating. C. Individuals recognize and only respond to songs of their own species. D. One population eats mostly small, soft seeds and the other population eats mostly large, hard seeds. A, B andC