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Robin Seeley Case

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What evidence, if any, does Robin Seeley have that the periwinkles of Appledore Island vary in the thickness of their shells? If there is not any, what evidence is missing? (1 point)
Seeley was able to collect the shell thickness datas from 1871 when there were no green crabs and datas from 1982 to 1984. Seeley could find the snail shells varied in thickness.

What evidence does Seeley have that shell thickness is heritable? If there is not any, what evidence is missing? (Again, think carefully.) (1 point)
Seeley was not able to find the evidence that the shell thickness is heritable. However, she could have breeded the snails over several generations and see compare the shell thickness of parents and their offsprings. What evidence does Seeley have that snails with thick shells are more likely to survive than snails with thin shells? If there is not any, what evidence is missing? (Think carefully.) (1 point)
Seeley found out the snails with thicker shells are better at protecting themselves from the crabs. Seeley could find out crabs can break and eat the snails with thinner shells more easily. However, the crabs struggled a lot to break the snails with thicker shells. …show more content…
Then ten thin shelled snails and two green crabs were added in tank 1 and thick shelled snails and two green crabs were added in tank 2. Then the test was simulated for 60 days. After the simulation, the number of snails survived from each tank on the table was recorded. The same procedure was repeated twice more. After all the datas were recorded, the number of thin shelled survived from each trial were added up and divided by three to obtain the average number of thin shelled snail survived. Same calculation method was used for the thick shelled snails. Then the graph was drawn after getting the average number of thin shelled and thick shelled snails

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