DNA . Genetics In the 150 years since Mendel's first experiments, geneticists have discovered that genetic traits usually don't follow simple inheritance patterns. Some traits, like human eye color and stature, are produced by the interplay of many sets of genes; these are known as "polygenic traits." Other traits show a phenomenon called intermediate expression, in which a heterozygous genotype will produce a phenotype that's different from homozygous dominant genotypes. In snapdragons, for example, a homozygous dominant genotype makes red flowers, homozygous recessive makes white flowers, and heterozygous individuals are pink. In addition, some genes have more than two different versions. Now that you know a little about blood types, let's learn about the genes that code for them.
Genetics Course|Biology Course Summary This course is based on 7.03 Genetics, Fall 2004 made available by Massachusetts Institute of Technology: MIT OpenCourseWare under the Creative Commons BY-NC-SA license. This course discusses the principles of genetics with application to the study of biological function at the level of molecules, cells, and multicellular organisms, including humans. Reading Material 1. Course Material Not available. Other Resources 1. Software
Structure of a Muscle Cell (Muscle Fibre) This page follows on from the more general page about the structure of muscle. Skeletal muscles consist of 100,000s of muscle cells (also known as 'muscle fibers') that perform the functions of the specific muscle of which they are a part. The diagram above shows some detail of the structure of a muscle cell. It illustrates the distinctive structure of muscle cells, including striated myofibrils (components of muscle cells only). It is also important to remember that the components essential for all cells (not all of which are illustrated in the diagram above) are also present in muscle cells. General components of Muscle Fibres/cells: The components of skeletal muscle cells that are specific to muscle tissue are myofibrils. More specialised components of Muscle Fibres (Muscle Cells): The components of skeletal muscle cells that are specific to muscle tissue are called myofibrils. Each myofibril consists of two types of protein filaments called 'thick filaments', and 'thin filaments'.
Animated Blood Types Since Rh negative people may produce anti-Rh antibodies, Rh positive blood should not be given to an Rh negative recipient. Based upon the above table, Rh positive recipients can theoretically receive positive or negative blood, and Rh negative donors can theoretically give to Rh positive and Rh negative recipients. Therefore, the "universal donor" is O Negative, while the "universal recipient" is AB Positive. Anti-Rh (immune-type) antibodies can readily pass through the placental capillary membranes. The medical term for this maternal-fetal condition is "erythroblastosis fetalis" because of the presence of nucleated, immature RBCs called erythrobasts in the fetal circulatory system. There are also reported cases of maternal-fetal blood incompatibility with the A-B-O blood groups; however, the Rh factor appears to be much more common. Like most topics in biology, the true life explanation is a lot more complicated.
The PCR Method - a DNA Copying Machine Lists of Nobel Prizes and Laureates The PCR Method - a DNA Copying Machine Play the Eye of the Donkey Game About the game PCR is a method by which a few fragments of DNA can be duplicated into millions in a couple of hours. This makes PCR a very useful method in, amongst other fields, forensic science. The Nobel Prize The 1993 Nobel Prize in Chemistry was awarded for the invention of PCR, a method that made it possible to copy a large numbers of DNA fragments in only a few hours. Share this: Share on facebook Share on google_plusone_share Share on twitter More Sharing Services Share on email To cite this pageMLA style: "The PCR Method - a DNA Copying Machine". Recommended: The Legacy of Alfred Nobel On 27 November 1895 Alfred Nobel signed his last will in Paris. Play the Blood Typing Game Try to save some patients and learn about human blood types! Unlocking the Secrets of Our Cells Discover the 2012 awarded research on stem cells and cell signalling. Contact E-mail us Press Sitemap A-Z Index Terms
MadSciNet: The 24-hour exploding laboratory. Chpt 3 One Wrong Letter 3D Animation Library Animations can be viewed within your web browser or downloaded for play from your computer. In some genes the protein-coding sections of the DNA ("exons") are interrupted by non-coding regions ("introns"). RNA splicing removes the introns from pre mRNA to produce the final set of instructions for the protein. Transcript: As DNA is transcribed into RNA it needs to be edited to remove non-coding regions, or introns, shown in green. RNA splicing begins with assembly of helper proteins at the intron/exon borders. This process is repeated for every intron in the RNA.
ActionBioscience - promoting bioscience literacy Fundamental Biosciences Life sciences include disciplines of science that are concerned with the scientific study of life – including microbes, plants, and animals, including humans. Biology is an umbrella term for the natural sciences that study life, with the other life sciences serving as subfields. In our holistic approaches to health, life and wellbeing, the area of Life Sciences complements all areas of our website with a more scientific point of view to better understand the advances in bioscience and their profound implications. Also, in the area of Life sciences, we aim to promote the understanding of biodiversity of life and improve bioscience literacy to increase global ecological consciousness and promote bioscience education. Goals and Features of Bioscience on ICWB.com To achieve the beforementioned aims, this section features articles written by scientists, scientific educators and science students on a variety of bioscience-related subjects.