Notice that each axis of these graphs include both a

Notice that each axis of these graphs include both a -...

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Notice that each axis of these graphs include both a measurement component and a time component simply because growth by definition is both a temporal and a dimensional phenomenon. Note that only one of these examples of different growth plans (graph B) demonstrates "ontogeny recapitulates phylogeny": hypermorphosis. Therefore, shape changes can be observed as 1) changes in the slope of an allometric relationship, or 2) changes in the y intercept of an allometric relationship. Recalling high school algebra, a change in the slope will change the intercept, but the intercept can be changed without changing the slope (keep the line parallel and move it up or down). All of these changes result in change in shape . Even with the same slope but different intercepts the relative sizes of x and y will be different so there will be a change in shape. The only case where there is a change in size with no change in shape is when the allometric slope = 1.0 and growth continues (or retards) relative to
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This note was uploaded on 11/06/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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