bio lab thingy

bio lab thingy - Elaine Denina Nohemy Morones Greg Reynolds...

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Elaine Denina Nohemy Morones Greg Reynolds Rebecca Yae Section 123 Study D: Convergence Study D focused around the presence of convergence in the jojoba ( Simmondsia chinensis ) and manzanita ( Arctostaphylos spp.) plants of the Chaparral collection. The goal of the study question was to discover if the similar features of the jojoba and manzanita were actually resultant of convergence or from the presence of a common ancestor. The jojoba plant is a shrub around four feet in height and growing in a variety of shapes and in the southwest regions of the United States. Its leaves exhibit a growing pattern with the end of the leaf blade pointing to the sky with small elliptical leaves growing throughout the plant. Its leaves are netlike, implying that they are dicot. The leaves are evergreen and grow on a variety of smaller branches coming off of a smaller number of main branches. The manzanita, found in the northern California region as well as various other regions, shows these same traits upon physical examination and its leaves, though they are a little more green, show the same upright growth and general plant shape, although the bark exhibits a darker hue. One striking difference is that the jojoba seems to have berries, whereas the manzanita has flowers: they seem to be on different cycles of growth. Hypothesis I proposes that the similar leaf morphologies of the jojoba and manzanita result from convergence, meaning it is correct for the two plants to be placed in distantly related families. On the other hand, hypothesis II asserts that the similar leaf morphologies of the plants result from a common ancestor; in other words, it is correct for them to be placed in closely related families, if not the same family. For a preliminary test, the plants as wholes should be compared at a
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This note was uploaded on 09/07/2009 for the course BIO 1B taught by Professor Carlson,mischel,power during the Spring '07 term at Berkeley.

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bio lab thingy - Elaine Denina Nohemy Morones Greg Reynolds...

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