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13. gene. The Columbia Encyclopedia, Sixth Edition. 2001
- www.bartleby.com
- The strands of DNA on which the genes occur are organized into chromosomes. The nucleus of each eukaryotic (nucleated) cell has a complete set of chromosomes and therefore a complete set of genes. ... Genes govern both the structure and metabolic functions of the cells, and thus of the entire organism and, when located in reproductive cells, they pass their information to the next generation.
- Genes may vary in their precise makeup from person to person, including, for example, one nucleotide in a certain location in some people but another nucleotide in that location in others. ... Junk DNA makes up 97% of the DNA in the human genome, and, despite its name, is necessary for the proper functioning of the genes.
- Each chromosome of each species has a definite number and arrangement of genes. Alteration of the number or arrangement of the genes can result in mutation. ...
- The sum total of the genes contained in an organisms full set of chromosomes is termed the genome. ...
14. Wnt genes
- www.stanford.edu
- Wnt genes, proteins.
- Other genes.
- SFRP/FrzB genes March 2004 .
- Here some links to other pages on Wnt signaling This site was Featured in Science NetWatch Meetings on Wnt signaling are posted here Answers to some FAQ Many genes are directly linked to GenBank or Genecards or to Ensemble. For several genes, links to Prosite, Flybase or "The Interactive Fly" have been made. ... Wnt genes and Wnt signaling are also implicated in cancer. ... Many Wnt genes in the mouse have been mutated, leading to very specific developmental defects. ... Through several cytoplasmic relay components, the signal is transduced to beta-catenin, which then enters the nucleus and forms a complex with TCF to activate transcription of Wnt target genes. ...
- Target Genes Dec 2004 .
- Feedback target genes (Wnt components) Dec 2004.
15. Washington University - Department of Genetics - St. Louis Missouri
- www.genetics.wustl.edu
- Geneticists seek to understand how genes are inherited, modified, and expressed. ... How is it that only the appropriate genes are turned on in a particular cell type? How do genes direct cells to have different fates, ultimately resulting in the development organism with many different cell types? How does the cell choreograph the events of cell division so that only one copy of each gene is passed on to the next generation? By what processes are genes altered to provide the raw material for evolution? How do multiple genes contribute to complex phenotypes, such as human disease? The possibility of finding answers to such fundamental questions makes genetics one of the most exciting fields of biology. ...
16. genes from On-line Medical Dictionary
- cancerweb.ncl.ac.uk
- genes.
- Located in the nucleus of the cell, genes contain hereditary information that is transferred from cell to cell. ...
- Next: genes, abl, genes, apc, genes, arac, genes, archaeal, genes, bacterial.
17. The Basics on Genes and Genetic Disorders
- kidshealth.org
- KidsHealth > Teens > Your Body > Health Basics > The Basics on Genes and Genetic Disorders.
- Have people ever said to you, "It's in your genes?" They were probably talking about a physical characteristic, personality trait, or talent that you share with other members of your family. We know that genes play an important role in shaping how we look and act and even whether we get sick. ...
- To understand how genes (pronounced: jeens) work, let's review some biology basics. ...
- So where do genes come in? Genes are sections or segments of DNA that are carried on the chromosomes and determine specific human characteristics, such as height or hair color. Because each parent gives you one chromosome in each pair, you have two of every gene (except for some of the genes on the X and Y chromosomes in boys because boys have only one of each). ... Because every person has from 25,000 to 35,000 different genes, there is an almost endless number of possible combinations!.
- Genes and Heredity.
- Heredity is the passing of genes from one generation to the next. You inherit your parents' genes. ...
- Can your genes determine whether you'll be a straight-A student or a great athlete? Heredity plays an important role, but your environment (including things like the foods you eat and the people you interact with) also influences your abilities and interests.
- How Do Genes Work?.
- Genes hold the instructions for making protein products (like the enzymes to digest food or the pigment that gives your eyes their color). ... Genes can be dominant or recessive. Dominant genes show their effect even if there is only one copy of that gene in the pair. ...
- Cells can sometimes contain changes or variants in the information in their genes. ...
18. Genes, Brains, Behavior
- serendip.brynmawr.edu
- Genes, Brains, Behavior:.
- Virtually all behavior is influenced by genes. ...
- Virtually no behavior is determined by genes. ...
- Genes, Environments, and Individual Choice .
- GUEST ARTICLE: Our Genes, Ourselves? by Ari Berkowitz .
- | Forum | Genes and Behavior | Biology | Serendip Home | .
19. FlyServer
- pbio07.uni-muenster.de
- FlyView is an image database on Drosophila development and genetics, especially on expression patterns of genes (enhancer trap lines, cloned genes). ...
20. spiked-science | Article | Genes, culture and human freedom
- www.spiked-online.com
- Genes, culture and human freedomWhat it is to be human.
- Over the past half century there has been a fierce dispute as to whether human behaviour is determined by our genes or by our environment. ...
- This suggested that human beings possess far fewer genes than previously thought; not the 100,000 genes that many had believed, but more like 30,000. We have a genome barely bigger than that of corn plant, and possess just 300 more genes than a mouse.
- Perhaps we should rather celebrate the fact that a creature with barely more genes than a cress plant can nevertheless unravel the complexities of its own genome.
- 'We simply do not have enough genes for the idea of genetic determinism to be right', claimed Craig Venter, the founder of Celera, the private company which played a major part in the human genome project (2).
- Given that fruit flies possess half our number of genes, should we consider them twice as free as we are?.
- A moment's reflection should reveal how unfounded is the argument that fewer genes means greater freedom. If it had turned out, for instance, that humans possessed 200,000 genes, would that have implied that we are slaves to our nature? And given that fruit flies possess half our number of genes, should we consider them to be twice as free as we are? .
- But the argument for the importance of heredity has never rested on arguments about the number of genes we might possess. ... The interpretation of the data from such studies may leave much to be desired, but handwaving about numbers of genes will not make any difference to that data. ...
- The fact that humans have fewer genes than expected does not mean that we are governed more by nurture than by nature. ... Being controlled by one's environment does not make one any freer than being controlled by one's genes.
21. Cat Fanciers: Color Genetics
- www.fanciers.com
- Several genes can cause variation in the density of the the melanin granules, so other colors can be produced. ...
- Not shown in the preceding table are two further mutations in the albino series which always have solid white coats, regardless of the other genes for pigmentation. ...
- This mutation overrides all other genes for pigmentation, and produces a white coat and blue eyes. ...
- In the dominant white, the other genes for color and pattern are still present, but they are completely hidden. ...
- The agouti and tabby genes combine with the basic pigments to create the following patterns and colors: .
- The agouti and tabbying genes also apply to all the colors generated by the albino series (sepia, mink, and pointed colors), but space does not permit them to be listed here. ...
- The effect is to produce a hair shaft that has a colored tip, in whatever color is determined by the color genes, and then much lighter below the tip. ...
- A more recent theory proposed another single dominant gene, called the inhibitor gene (I), but this theory was inadequate to explain the variations of shading and did not correlate with the experiences of breeders, so current theories propose at least two genes. ...
- Cats that are homozygous (S/S) tend to have more white area than cats that are heterozygous (S/s) for white spotting, but there are other modifying genes that can affect the degree of white spotting. ...
- By convention, genes for discrete characteristics are symbolized by letters; usually the letters are derived from the initial letter of the gene name. ...
- An individual cat has a pair of genes for each particular trait, one inherited from each parent. ... A black cat that carries the recessive gene for chocolate would be symbolized by (B/b) because is received different genes from its two parents.
22. The brain, circadian rhythms, and clock genes -- Hastings 317 (7174): 1704 -- BMJ
- bmj.bmjjournals.com
- The brain, circadian rhythms, and clock genes .
- Circadian timekeeping is a fundamental property of all higher forms of life In mammals the principal circadian mechanism lies in the individual neurones of the suprachiasmatic nuclei Comparative studies of the clock in mammals and fruit flies have provided a model of autoregulatory feedback to explain its basic properties The genes encoding this feedback loop, and how they and their protein products respond to synchronising cues, are being characterised This opens the way for an understanding of how genes regulate a basic aspect of behaviour and what are suitable targets for intervention when this timing mechanism breaks down .
- By analysing the circadian patterns of activity and emergence from the pupal case of mutant flies, several genes have been identified that encode essential elements of the clock. 6 7 Mutations of these genes can either speed up or slow down the clock, giving flies with days of 20 or 28 hours. ...
- Early cycle: Expression of the clock genes period (per) and timeless (tim) is stimulated by the factors Bmal and Clock (blue/green circles). ... Mid-cycle: As the concentrations of Per and Timeless (Tim) proteins increase, the proteins form heterodimers (red and grey clusters), which enter the nucleus and suppress the expression of per and tim genes. Late cycle: Transcription of the genes is halted. ...
- The proteins encoded by these genes are components of a self sustaining negative feedback loop, which is now thought to form the driving oscillation of the timing system. ... The genes encoding these proteins (per and tim respectively) are active in the early part of the night, producing mRNA; proteins start to accumulate later in the night. ... This is a key event because these clock proteins have another propertythey can control the activity of various genes. Expression of the per and tim genes is suppressed by their own dimerised protein products, closing the feedback loop. As a result, once the dimers gain access to the nucleus, the clock genes are turned off and no new clock mRNA or protein is synthesised. After a lag the existing proteins in the nucleus start to be broken down and the genes are released from inhibition to become active again and reinitiate the cycle. ...
- The parallels between the fly and mammalian forms of the genes show that evolution has conserved not only the property of circadian timing but also its molecular basis, indicating how deeply the clock is entrenched in our make up. ...
- What the feedback model of drosophila does not explain is why removal of inhibition would be followed by gene switch onin other words, what positive factors are responsible for activating per and tim when the heterodimer proteins are inactivated? These positive factors have now been identified as the Clock and Bmal proteins: positive transcriptional regulators which act together to stimulate the per and tim genes. 10 Mutations of clock in mice and of the equivalent genes in drosophila ablate circadian rhythmicity, probably because the per and tim genes need this positive drive to trigger a new cycle. ...
23. BBC News | SCI/TECH | Genius of genes
- news.bbc.co.uk
- Tuesday, 8 August, 2000, 21:51 GMT 22:51 UK Genius of genes.
- To what extent is one's IQ written in the genes.
- The discovery has been seized on by some on the Right who claim it backs their view that the way people turn out depends more on the genes with which they are born rather than on the schools they attend. ...
- In other words, the scientists are homing in on the genes for genius. ...
- The team believe more than one gene is involved - and that these genes can make a big difference to a person's intelligence. ...
- "I think we need to recognise that genetic influences are important and that we will find genes for intelligence," he told the BBC. ...
- The next step will be to discover what these genius genes do. ...
24. Gene - Wikipedia, the free encyclopedia
- en.wikipedia.org
- (Redirected from Genes) This stylistic schematic diagram shows a gene in relation to the double helix structure of DNA and to a chromosome (right). Introns are regions often found in eukaryote genes which are removed in the splicing process: only the exons encode the protein. ... In reality many genes are much larger. ...
- Genes are entities that parents pass to offspring during reproduction. ...
- In the molecular-biological sense, genes are the segments of DNA which cells transcribe into RNA and translate, at least in part, into proteins.
- This is because biologists know that many factors other than genes decide whether a person is obese or not: prenatal environment, upbringing, culture and the availability of food, for example.
- These aspects of inheritance—the interplay between genes and environment, the influence of many genes—appear to be the norm with regard to many and perhaps most ("complex" or "multifactoral") traits. ...
- 1 Properties of genes 1. 2 Types of genes 1. ... 4 Typical numbers of genes in an organism.
- 2 Chemistry and function of genes .
- 2 Expression of molecular genes 2. ...
- Properties of genes.
- Through the proteins they encode, genes govern the cells in which they reside. ...
- The genes that exist today are those that have reproduced successfully in the past. ... He points out in his book, The Selfish Gene, that to be successful genes need have no other "purpose" than to propagate themselves, even at the expense of their host organism's welfare. ...
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