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Figure 9-13. Twenty-three basic branching patterns in plants. Reprinted from (Halle 1999), with permission from Elsevier.

other genes generate the different expression zones early in the developmental cascade, which allows differentiation to occur. Experimental manipulation of these genes has produced homeotic mutations, which shows the combinatorial nature of this system of identity determination. Plants like maize with separate male and

Whorl 1: sepals

Whorl 1: sepals

Whorl 2: petals

Whorl 3: stamens

Whorl 4: carpels

Whorl 2: petals

Whorl 3: stamens

Whorl 4: carpels

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