Only about 6% of plant species have separate male and female individuals (a syndrome called dioecy). The

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Only about 6% of plant species have separate male and female individuals (a syndrome called dioecy). The rest of the species have individuals with both male and female parts (called monoecy). Why are there so many more monoecious than dioecious species of plants? One possibility is that dioecious plants have low speciation rates or high extinction rates. To test this, Heilbuth (2000) compared the numbers of species in pairs of plant taxa of similar age. In each pair, one group was monoecious and the other group was the most closely related taxon that is dioecious. The data are shown in the following table.

Taxon pair 11 22 33 44 55 66 77 88 99 1010 Number of species in dioecious group 11 11 11501150 99 11 44 1111

1111 1212 1313 1414 1515 1616 1717 1818 1919 2020 2121 2222 2323 2424 2525 2626 2727 2828 66 1717 405405 3.3

a. Before testing the difference, plot the data to help you decide which test to perform.

b. Carry out an appropriate test to determine whether monoecious and dioecious groups differ in the number of species.

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Related Book For  answer-question

The Analysis Of Biological Data

ISBN: 9781319226237

3rd Edition

Authors: Michael C. Whitlock, Dolph Schluter

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