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A perennial shrub has compound leaves and solitary zygomorphic and epigynous flowers....

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tinacullen-13 | Student, Undergraduate | (Level 1) Honors

Posted May 29, 2013 at 1:15 PM via web

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A perennial shrub has compound leaves and solitary zygomorphic and epigynous flowers. Each flower reveals dichlamydeous condition with many stamens and multiple fruit with exalbuminous seeds. What is the ratio of advanced and primitive characters in it?

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pacorz | High School Teacher | (Level 3) Educator

Posted July 23, 2013 at 3:30 PM (Answer #1)

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Virtually all living angiosprem plants show a mixture of primitive (ancestral) traits and advanced traits, which are used to trace the evolution of the species.

In this example, the more advanced botanical charcteristics would be:

  • compound leaves
  • dichlamydeous flowers
  • exalbumonous seeds
  • compound leaves
  • multiple fruits
  • zygomorphic flowers

 

The primitive characteristics are:

  • epigynous flowers
  • large number of stamens
  • solitary flowers

This gives us a total of 6 advanced and 3 primitive characteristics, so the ratio is 6:3, which reduces to 2:1.

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