Which observation of the medium ground finch (Geospize fortis) by Peter and Rose

Question

Which observation of the medium ground finch (Geospize fortis) by Peter and Rosemary Grant verify Darwin's selection hypothesis? a. Considerable variation existed in the beak size and shape of this finch. b. The medium ground finch showed assortative mating according to beak size and shape. c. Beak shape (depth) did not varied with the dryness of the year. d. Offspring were not similar to parents in beak size and shape. In studying the medium ground finch on Daphne Major, the Grants noted that each generation of finches had beaks a. best suited for their parents' environment. b. best suited for their current environment c. smaller than those of the previous generation, d larger than those of the previous generation Which aspect(s) of natural selection is(are) illustrated by the figure below ?. a. Variation must exist in all areas of the continent. b. Variation among individuals must be genetically transmissible to the next generation. c. Variation among individuals leads to differences in lifetime reproductive success. d. More individuals are produced each generation than the environment can support, resulting in competition for survival.

Explanation / Answer

Answer 1: b. (As explained below)

Food availability, not mating choice, is the selective pressure driving the evolution of beak shape.

Answer 2: a. (As explained below)

As per observations made by the Grants on Daphne Major.

Answer 3: a and b (As explained below)

The graph does not indicate any statistics on number of offspring produced or the reproductive success. So, options c and d are incorrect. It however, clearly indicates the variations in individual offspring related to its parents. Thus, options a and b are correct.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.