[47775] in linux-announce channel archive
Taste the Best: Win the Omaha Steaks Sampler
daemon@ATHENA.MIT.EDU (Omaha Steaks Customer Rewards)
Mon Mar 3 16:33:49 2025
Date: Mon, 3 Mar 2025 22:33:18 +0100
From: "Omaha Steaks Customer Rewards" <OmahaSteaksGiveaway@jointlocalhero.sa.com>
Reply-To: "Omaha Steaks Official" <OmahaSteaksCustomerRewards@jointlocalhero.sa.com>
To: <linuxch-announce.discuss@charon.mit.edu>
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Taste the Best: Win the Omaha Steaks Sampler
http://jointlocalhero.sa.com/oFkjj7Kr2NOX5GXxPdP3Nair467OZUQSMLnZnlqV4s6al6bMzQ
http://jointlocalhero.sa.com/Mdgt2WWN4ZCIYMQidzKEY8FmprxUi4pQgACBIpS5I0D5n2DhJQ
he ABC model is a simple model that describes the genes responsible for the development of flowers. Three gene activities interact in a combinatorial manner to determine the developmental identities of the primordia organ within the floral apical meristem. These gene functions are called A, B, and C. Genes are expressed in only the outer and lower most section of the apical meristem, which becomes a whorl of sepals. In the second whorl, both A and B genes are expressed, leading to the formation of petals. In the third whorl, B and C genes interact to form stamens and in the center of the flower C genes alone give rise to carpels. The model is based upon studies of aberrant flowers and mutations in Arabidopsis thaliana and the snapdragon, Antirrhinum majus. 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. In the third whorl, the lack of the B function but the presence of the C function mimics the fourth whorl, leading to the formation of carpels also in the third whorl.
Function
See also: Plant reproductive morphology
The principal purpose of a flower is the reproduction of the individual and the species. All flowering plants are heterosporous, that is, every individual plant produces two types of spores. Microspores are produced by meiosis inside anthers and megaspores are produced inside ovules that are within an ovary. Anthers typically consist of four microsporangia and an ovule is an integumented megasporangium. Both types of spores develop into gametophytes inside sporangia. As with all heterosporous plants, the gametophytes also develop inside the spores, i.e., they are endosporic.
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<div style="color:#FFFFFF;font-size:10px;">he ABC model is a simple model that describes the genes responsible for the development of flowers. Three gene activities interact in a combinatorial manner to determine the developmental identities of the primordia organ within the floral apical meristem. These gene functions are called A, B, and C. Genes are expressed in only the</div>
<div style="color:#FFFFFF;font-size:10px;">primordia organ within the floral apical meristem. These gene functions are called A, B, and C. Genes are expressed in only the outer and lower most section of the apical meristem, which becomes a whorl of sepals. In the second whorl, both A and B genes are expressed, leading to the formation of petals. In the third whorl, B and C genes interact to form stamens and in the center of the flower C genes alone give rise to carpels. The model is based upon studies of aberrant flowers and mutations in Arabidopsis thaliana and the snapdragon, Antirrhinum majus. For example, when there is a loss</div>
<div style="color:#FFFFFF;font-size:10px;">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. In the third whorl, the lack of the B function but the presence of the C function mimics the fourth whorl, leading to the formation of carpels also in the third whorl. Function See also: Plant reproductive morphology</div>
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<div style="color:#FFFFFF;font-size:10px;">The principal purpose of a flower is the reproduction of the individual and the species. All flowering plants are heterosporous, that is, every individual plant produces two types of spores. Microspores are produced by meiosis inside anthers and megaspores are produced inside ovules that are within an ovary. Anthers typically consist of four microsporangia and an ovule is an integumented megasporangium. Both types of spores develop into gametophytes inside sporangia. As with all heterosporous plants, the gametophytes also develop inside the spores, i.e., they are endosporic.</div>
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