题目
题目

BIS 002B Sections A and B SQ 2025 Practice Midterm #2

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Geospiza fortis is a seed-eating finch that lives on Daphne Major, a small island in the Galápagos archipelago. Geospiza fuliginosa is a second species of seed-eating finch found in the Galápagos islands, and this species occurs together with G. fortis on a larger island called Santa Cruz. The graphs below show the distribution of beak sizes of G. fortis when it co-occurs with G. fuliginosa vs. when it occurs alone.  Based only on these data, you can conclude that (select all that apply).  

选项
A.Beak size is a heritable trait for Geospiza fortis
B.Beak size is a heritable trait for Geospiza fuliginosa
C.There is variation in beak size in BOTH species
D.The beak size of Geospiza fortis differs in sympatry and allopatry in a way that is consistent with character displacement
E.The beak size of Geospiza fuliginosa differs in sympatry and allopatry in a way that is consistent with character displacement
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思路分析
First, observe that the data present beak size distributions for two scenarios: Geospiza fortis when it lives alone on Daphne Major (upper graph) and Geospiza fuliginosa together with G. fortis on Santa Cruz alongside G. fortis (lower graphs). This setup allows us to assess variation within and between the species, as well as potential displacement effects. Option 1: Beak size is a heritable trait for Geospiza fortis. While beak size shows variation, the graphs do not provide any......Login to view full explanation

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Where species with overlapping niches compete, then can diversify through the process of ________  _________, resulting in niche diversification and co-existence (answer is two words)

CHOOSE THE BEST ANSWERS In regions where bobcats and lynx do not co-occur, the two species have similar-sized teeth and catch similar-sized prey. In regions where the two species do co-occur, lynx have much longer teeth and capture larger prey than bobcats. Differences in tooth size between lynx and bobcats that co-occur is an example of [ Select ] Competitive exclusion Competitive interference Competitive exploitation Character displacement , which is an evolutionary outcome of [ Select ] predation competition commensalism mutualism .

Larger crayfish are better at defending shelters than smaller crayfish, regardless of what species they are.  Small crayfish can escape competition by occupying small rocks that are not sought after by larger crayfish.  The size distribution of the two species is shown in the frequency versus size graph. What is the most likely outcome of competition between species A and B? Competitive coexistence The two species have evolved different body sizes. This is an example character displacement , an evolutionary outcome of competition.

On the Galapagos Islands, two species of finches display a character displacement when they occur as sympatric species. Which of the statements correctly interprets the species over time when they are found sympatrically?

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