Using the method of independent contrasts, Dylan Schwilk and David Ackerly studi

Question

Using the method of independent contrasts, Dylan Schwilk and David Ackerly studied branch retention and serotiny in 38 species of pine trees (Schwilk and Ackerly 2001). Which statement is correct about their study? a. For the traits of branch retention and serotiny, they calculated each of the independent contrasts for the 38 species and found a statistically significant positive correlation between the two Ob. The traits of branch retention and serotiny were always found in the same species of pine Oc. The traits of branch retention and serotiny were never found in the same species of pine; some species had improved branch retention and others had serotiny. Od. The 38 pine species show phylogenetic independence from each other.

Explanation / Answer

Option a is correct They hypothesized that, during the construction of fire by the plant species has an evolutionary consequences. The plants that create conditions for the frequent and severe fire induces natural selection on themselves for tratits allow rapid regeneration after fires have passed through Due to the phylogenetic independence they used method of independent contrast By the mthod of independent contrast they found a statitical significant association between the branch retention and serotony for the phylogenetic history of species They found out that flammability enhancing trees rapidly regenerate after fire

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