Examples of sepal in the following topics:
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- Although they vary greatly in appearance, all flowers contain the same structures: sepals, petals, carpels, and stamens.
- A whorl of sepals (collectively called the calyx) is located at the base of the peduncle and encloses the unopened floral bud.
- Sepals are usually photosynthetic organs, although there are some exceptions.
- For example, the corolla in lilies and tulips consists of three sepals and three petals that look virtually identical.
- Sepals and petals together form the perianth.
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- The ABC model of flower development was first developed to describe the collection of genetic mechanisms that establish floral organ identity in the Rosids and the Asterids; both species have four verticils (sepals, petals, stamens and carpels), which are defined by the differential expression of a number of homeotic genes present in each verticil.
- In the first floral whorl only A-genes are expressed, leading to the formation of sepals.
- For example, when there is a loss of B-gene function, mutant flowers are produced with sepals in the first whorl as usual, but also in the second whorl instead of the normal petal formation.
- Class A genes (blue) affect sepals and petals, class B genes (yellow) affect petals and stamens, class C genes (red) affect stamens and carpels.
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- The outermost whorl of the flower has green, leafy structures known as sepals, which are collectively called the calyx, and help to protect the unopened bud.
- The number of sepals and petals varies depending on whether the plant is a monocot or dicot.