Video Experimental Relacionado
Updated: Jul 15, 2026
09:17
Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques
Published on: April 12, 2018
Comentario sobre "Caminos evolutivos que subyacen a la variación del color de las flores en Antirrhinum"
1Department of Biology, Duke University, Box 90338, Durham, NC 27708, USA. mrausher@duke.edu
Science (New York, N.Y.)
|January 27, 2007
Resumen
El estudio desafía la idea de crestas de alta aptitud en la evolución del color floral de Antirrhinum, lo que sugiere que es más probable un paisaje adaptativo más simple y de un solo pico. La evidencia de selección divergente contradice la presencia de crestas adaptativas en este sistema.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- Genética de poblaciones genética de poblaciones.
- Ciencias de las plantas Ciencias de las plantas.
Sus antecedentes:
- Los paisajes adaptativos modelan las trayectorias evolutivas.
- La evolución del color floral está influenciada por las presiones de selección.
- Las zonas híbridas ofrecen información sobre la divergencia de la población.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:19Morphogenesis
Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
02:40Pollination and Flower Structure
Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.
01:43Incomplete Dominance
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
01:31Antigen Processing Pathways
MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
MHC Class I: Presenting Endogenous...
01:24Evolution of New Traits in Microbes
Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...