Finches Worksheet-Destiny Donald (1)

pdf

School

Brigham Young University, Idaho *

*We aren’t endorsed by this school

Course

101

Subject

Anthropology

Date

Apr 3, 2024

Type

pdf

Pages

Uploaded by Destinyyyd23

NAME: DATE: February 15,2023 This handout supplements the short film The Origin of Species: The Beak of the Finch . 1. Different finch species have beaks of different shapes and sizes. These different beak structures are evidence of _________ a. different finch species adapting to different environments over many generations. b. different finch species with different beak structures coming to the Galápagos Islands from the mainland. c. different finch populations being evolutionarily related. d. individual birds changing their beak characteristics so that they could feed efficiently. 2. Which experimental data from the film provide the best evidence that the cactus finch and the medium ground finch on Daphne Major are distinct species? __________ a. Many more medium ground finches than cactus finches died in response to the drought. b. Cactus finch and medium ground finch males attempted to breed only with females of their own species. c. The cactus finch and medium ground finch feed on different types of food. d. Medium ground finch and cactus finch females have different markings and feather color. 3. Which of the five statements below describe(s) geographically isolated populations? Select the appropriate answer, a–d. __________ i. The two populations live on different islands. ii. One population breeds in late spring and the other population breeds in late summer. iii. One population eats mostly small, soft seeds and the other population eats mostly large, hard seeds. iv. The males of one population have different mating calls than the males of the other population. v. The females of the two populations look the same. a. statement i only b. statements i and iv only c. statements ii, iii, and v only d. statement iv only 4. Which of the five observations below provide(s) evidence that two populations are likely experiencing reproductive isolation and that there is little if any genetic exchange between them? Select the appropriate answer, a–d. ________ i. The two populations live on different islands.

ii. One population breeds in late spring and the other population breeds in late summer. iii. One population eats mostly small, soft seeds and the other population eats mostly large, hard seeds. iv. The males of one population sing different songs than the males of the other population. v. The females of the two populations look the same. a. statement i only b. statements iii and v only c. statements i, ii, and iv only d. statements ii and iv only 5. Figure 1 shows the beak depths of 200 medium ground finches on Daphne Major before a severe drought began on the island. This is a normal sample of a population of medium ground finches, similar to measured samples from previous years. a. Make two or three observations about the distribution of beak depth - Measurements in this sample of 200 medium ground finches. - The range of beak depths is from approximately 8 mm to 13.5 mm. -Concentration of finches with beak depths around 10 mm. Figure 1. Beak sizes of a sample of 200 medium ground finches living on Daphne Major in 1976. b. What is the most common beak depth of the finches living on Daphne Major in 1976? 8.8 6. Figure 2 shows the same graph as in Figure 1 but with the birds that survived the drought shown by black bars. Figure 2. Beak sizes of medium ground finches living on Daphne Major in 1976 (gray bars) and of the finches that survived the drought of 1977 (black bars).

a. Compare the original group of medium ground finches (gray bars) to the group of survivors (black bars). List two observations you can make based on the data provided in the graph. Consider both the number of birds and beak characteristics. 1. The original population was much larger 2. The survivor population only consisted of 40 individuals with the most common beak depth b. Provide a possible explanation for the change. The birds that survived were able to crack open the large seeds for those who have a larger beak. Compared to the birds that died due to not being able to crack open the large seeds. 7. The graph in Figure 3 represents the beak sizes of the offspring of the birds that survived the drought of 1977. (The survivors were represented by the black bars in Figure 2, and this graph shows the beak depth distribution of their offspring in 1978.) Figure 3. Beak sizes of the offspring of the medium ground finches that survived the drought of 1977. Identify and describe similarities and differences between this group of medium ground finches and the following groups: a. the sample of 200 medium ground finches measured in 1976 (Figure 1). Individuals have increased to close to the number of birds in this population before the drought has occurred. b. the sample of medium ground finches that survived the drought of 1977 (Figure 2 black bars). - Number of offspring is greater than the number of parents that had produced the offspring. Although, the most common beak depth is not as large as the parent beak depth. c. Why do these similarities and differences exist? Describe briefly. Similarities and differences occur at times because of natural selection. Which can correlate with genetic mutations and similarities relating with common ancestry.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Finches Worksheet-Destiny Donald (1)

Related Documents