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Leavenworthia Texana
''Leavenworthia'' is a genus of flowering plants in the family Brassicaceae. It includes about eight species native to the southern and southeastern United States.''Leavenworthia''. Flora of North America. They are known generally as gladecresses.''Leavenworthia''. USDA PLANTS.''Leavenworthia''. Integrated Taxonomic Information System (ITIS). Description [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leavenworthia Stylosa
''Leavenworthia stylosa'' is a species of flowering plant in the family Brassicaceae known by the common names cedar gladecress or long-styled gladecress. It is found only in the Central Basin of Tennessee, where it grows in cedar glades, ditches, and low-lying fields. ''Leavenworthia stylosa'' typically blooms from March to May. The flowers are about 1 inch wide and are white or yellow in color with a yellow center. The tips of the petals are notched. Yellow varieties are found more commonly north of Nashville, while white varieties are found more commonly south. Habitat As the common name suggests, ''Leavenworthia stylosa'' grows only in cedar glades and adjacent habitat. Cedar glades are sites in the central eastern United States where limestone lies on the surface resulting in an unusual ecosystem. Along with Eastern red cedar ''Juniperus virginiana'', also known as red cedar, eastern red cedar, Virginian juniper, eastern juniper, red juniper, and other local names, is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mating System
A mating system is a way in which a group is structured in relation to sexual behaviour. The precise meaning depends upon the context. With respect to animals, the term describes which males and females mating, mate under which circumstances. Recognised systems include monogamy, polygamy (which includes polygyny, polyandry, and polygynandry), and promiscuity, all of which lead to different mate choice outcomes and thus these systems affect how sexual selection works in the species which practice them. In plants, the term refers to the degree and circumstances of outcrossing. In human sociobiology, the terms have been extended to encompass the formation of relationships such as marriage. In plants The primary mating systems in plants are outcrossing (cross-fertilisation), autogamy (self-fertilisation) and apomixis (asexual reproduction without fertilization, but only when arising by modification of sexual function). Mixed mating systems, in which plants use two or even all three ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leavenworthia Uniflora
''Leavenworthia uniflora'', called Michaux's gladecress or one-flowered gladecress, is a plant species native to the southeastern and Midwestern parts of the United States. It is reported from northwestern Georgia, northern Alabama, Tennessee, northern Arkansas, southern Missouri, Kentucky, southeastern Indiana and southwestern Ohio. It grows in open, sun-lit locations at elevations less than 500 meters (1700 feet). ''Leavenworthia uniflora'' is an herb up to 20 cm (8 inches) tall. Basal leaves are up to 13 cm (5.2 inches) long, pinnately Pinnation (also called pennation) is the arrangement of feather-like or multi-divided features arising from both sides of a common axis. Pinnation occurs in biological morphology, in crystals, such as some forms of ice or metal crystals, and in ... lobed with 3-10 pairs of lobes. Flowers are solitary, white, up to 6 mm across. Fruits are narrowly oblong, up to 3 cm (1.2 inches) long. References External linksphoto of h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leavenworthia Torulosa
''Leavenworthia torulosa'', the necklace gladecress, is a species of plant in the mustard family. It is native to the eastern United States where it is only found near limestone cedar glades of Alabama, Georgia, Kentucky, and Tennessee. It is considered rare in all states it is found except Tennessee, where it is common in the Nashville Basin due to the abundance of available habitat. It is found in more wet-mesic areas than typical ''Leavenworthia'' of the region, often growing in standing water. It is a winter annual An annual plant is a plant that completes its biological life cycle, life cycle, from germination to the production of seeds, within one growing season, and then dies. The length of growing seasons and period in which they take place vary accor ..., which makes it well adapted for the extreme wet and dry seasons of the cedar glades. It produces a relatively large yellow and white flower in early spring and dies with the arrival of summer. The constricted matur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leavenworthia Texana
''Leavenworthia'' is a genus of flowering plants in the family Brassicaceae. It includes about eight species native to the southern and southeastern United States.''Leavenworthia''. Flora of North America. They are known generally as gladecresses.''Leavenworthia''. USDA PLANTS.''Leavenworthia''. Integrated Taxonomic Information System (ITIS). Description [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leavenworthia Crassa
''Leavenworthia crassa'' is a species of flowering plant in the mustard family, Brassicaceae, known commonly as the fleshy-fruit gladecress. It is endemic to Alabama in the United States, where it occurs in only two counties. It is "likely one of the most imperiled plant species in the Southeast,"''Leavenworthia crassa''. NatureServe 2013. and the issued a final rule listing it as an in 2014.USFWS [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leavenworthia Aurea
''Leavenworthia'' is a genus of flowering plants in the family Brassicaceae. It includes about eight species native to the southern and southeastern United States.''Leavenworthia''. Flora of North America. They are known generally as gladecresses.''Leavenworthia''. USDA PLANTS.''Leavenworthia''. Integrated Taxonomic Information System (ITIS). Description [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leavenworthia Alabamica
''Leavenworthia alabamica'' is a species of flowering plant in the family Brassicaceae. It is commonly known as Alabama gladecress. It is endemic to Alabama. Description ''Leavenworthia ''Leavenworthia'' is a genus of flowering plants in the family Brassicaceae. It includes about eight species native to the southern and southeastern United States. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gene
In biology, the word gene (from , ; "...Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity..." meaning ''generation'' or ''birth'' or ''gender'') can have several different meanings. The Mendelian gene is a basic unit of heredity and the molecular gene is a sequence of nucleotides in DNA that is transcribed to produce a functional RNA. There are two types of molecular genes: protein-coding genes and noncoding genes. During gene expression, the DNA is first copied into RNA. The RNA can be directly functional or be the intermediate template for a protein that performs a function. The transmission of genes to an organism's offspring is the basis of the inheritance of phenotypic traits. These genes make up different DNA sequences called genotypes. Genotypes along with environmental and developmental factors determine what the phenotypes will be. Most biological traits are under the influence of polygenes (many different genes) as well as gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mutation
In biology, a mutation is an alteration in the nucleic acid sequence of the genome of an organism, virus, or extrachromosomal DNA. Viral genomes contain either DNA or RNA. Mutations result from errors during DNA or viral replication, mitosis, or meiosis or other types of damage to DNA (such as pyrimidine dimers caused by exposure to ultraviolet radiation), which then may undergo error-prone repair (especially microhomology-mediated end joining), cause an error during other forms of repair, or cause an error during replication (translesion synthesis). Mutations may also result from insertion or deletion of segments of DNA due to mobile genetic elements. Mutations may or may not produce detectable changes in the observable characteristics (phenotype) of an organism. Mutations play a part in both normal and abnormal biological processes including: evolution, cancer, and the development of the immune system, including junctional diversity. Mutation is the ultimate source o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genetics
Genetics is the study of genes, genetic variation, and heredity in organisms.Hartl D, Jones E (2005) It is an important branch in biology because heredity is vital to organisms' evolution. Gregor Mendel, a Moravian Augustinian friar working in the 19th century in Brno, was the first to study genetics scientifically. Mendel studied "trait inheritance", patterns in the way traits are handed down from parents to offspring over time. He observed that organisms (pea plants) inherit traits by way of discrete "units of inheritance". This term, still used today, is a somewhat ambiguous definition of what is referred to as a gene. Trait inheritance and molecular inheritance mechanisms of genes are still primary principles of genetics in the 21st century, but modern genetics has expanded to study the function and behavior of genes. Gene structure and function, variation, and distribution are studied within the context of the cell, the organism (e.g. dominance), and within the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolution
Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes, which are passed on from parent to offspring during reproduction. Variation tends to exist within any given population as a result of genetic mutation and recombination. Evolution occurs when evolutionary processes such as natural selection (including sexual selection) and genetic drift act on this variation, resulting in certain characteristics becoming more common or more rare within a population. The evolutionary pressures that determine whether a characteristic is common or rare within a population constantly change, resulting in a change in heritable characteristics arising over successive generations. It is this process of evolution that has given rise to biodiversity at every level of biological organisation, including the levels of species, individual organisms, and molecules. The theory of evolution by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
