definition of gene locus
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- Example of bands. A locus (plural loci) is the specific location or position of a gene, DNA sequence, on a chromosome, in the field of genetics. Each chromosome carries many genes; humans' estimated ' haploid ' protein coding genes are 20,000-25,000, on the 23 different chromosomes.or example, the locus of gene OCA1 may be written 11q1.4-q2.1, meaning it is on the long arm of chromosome 11, somewhere in the range from sub-band 4 of region 1 to sub-band 1 of region 2.
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Locus A locus is the specific physical location of a gene or other DNA sequence on a chromosome, like a genetic street address. The plural of locus is  loci .n genetics, the specific site of a gene on a chromosome. All the alleles of a particular gene occupy the same locus. locus. the specific point on a chromosome where the gene is found. Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition.
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Quantitative trait locus Moreover, a single phenotypic trait is usually determined by many genes. Consequently, many QTLs are associated with a single trait. A quantitative trait locus (QTL) is a region of DNA that is associated with a particular phenotypic trait. These QTLs are often found on different chromosomes. Knowing the number of QTLs that explains variation in the phenotypic trait tells us about the genetic architecture of a trait.
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- Allele frequency, or gene frequency, is the relative frequency of an allele (variant of a gene) at a particular locus in a population, expressed as a fraction or percentage.Specifically, it is the fraction of all chromosomes in the population that carry that allele.n population genetics, allele frequencies are used to describe the amount of variation at a particular locus or across multiple loci. When considering the ensemble of allele frequencies for a large number of distinct loci, their distribution is called the allele frequency spectrum.
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- The gene pool includes all genetic loci and all the alleles for each locus present in the population. The gene pool of a population can be described and characterized by certain statistical properties: Allele frequency (gene frequency) is the proportion of all alleles at a locus that are of a specified type.
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Annie The real media explosion didn't start until 1977, when the Charles Strouse, Martin Charnin musical became a surprise hit on Broadway, running for six years. It also swept the Tony Awards, and turned Annie's plaintive song Tomorrow into a standard.
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gene gene. A segment of DNA, occupying a specific place on a chromosome, that is the basic unit of heredity. Genes act by directing the synthesis of proteins, which are the main components of cells and are the catalysts of all cellular processes.oun. 1. gene - (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; genes were formerly called factors.
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- Often called gene frequency. A measure of how common an allele is in a population; the proportion of all alleles at one gene locus that are of one specific type in a population. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z.
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Definitions &Translations Genetic Loci. Specific regions that are mapped within a GENOME. Genetic loci are usually identified with a shorthand notation that indicates the chromosome number and the position of a specific band along the P or Q arm of the chromosome where they are found.or example the locus 6p21 is found within band 21 of the P-arm of CHROMOSOME 6. Many well known genetic loci are also known by common names that are associated with a genetic function or HEREDITARY DISEASE.
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Quantitative trait locus A quantitative trait locus (QTL) is a section of DNA (the locus) that correlates with variation in a phenotype (the quantitative trait).The QTL typically is linked to, or contains, the genes that control that phenotype.QTLs are mapped by identifying which molecular markers (such as SNPs or AFLPs) correlate with an observed trait. This is often an early step in identifying and sequencing the actual genes that cause the trait variation.he principle for QTL mapping is: 1) The Likelihood can be calculated for a given set of parameters (particularly QTL effect and QTL position) given the observed data on phenotypes and marker genotypes. 2) The estimates for the parameters are those where the likelihood are highest.
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Gene Gene. Definition. noun, plural: genes. (cell and molecular biology). The fundamental, physical, and functional unit of heredity. Supplement. It is because a gene is a segment of DNA (on a specific site on a chromosome) that is responsible for the physical and inheritable characteristics or phenotype of an organism. It also specifies the structure of a protein, and an RNA molecule. A gene is formerly called a factor.
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locus The definition of a locus is where a person or thing is located. An example of locus is the table upon which a glass is sitting.
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- Locus is a Latin word for place.. Its plural is loci.. In geometry, locus refers to a set of points that are described by some statement about their position. For example, the locus of points that are 1 unit from point A refers to the set of all points that are 1 unit from point A. This would be the circle with center A:
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Linked genes Linked genes. Definition. noun, singular: linked gene. Genes that are inherited together with the other gene (s) as they are located on the same chromosome. Supplement. When a pair or set of genes are on the same chromosome, they are usually inherited together or as a single unit. For example, in fruit flies the genes for eye color and the genes for wing length are on the same chromosome, thus are inherited together.
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gene Definition of GENE for Kids. : a unit of DNA that is usually located on a chromosome and that controls the development of one or more traits and is the basic unit by which genetic information is passed from parent to offspring.efinition of GENE for Kids. : a unit of DNA that is usually located on a chromosome and that controls the development of one or more traits and is the basic unit by which genetic information is passed from parent to offspring.
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Definitions &Translations Gene mapping. Gene mapping, also called genome mapping, is the creation of a genetic map assigning DNA fragments to chromosomes. When a genome is first investigated, this map is nonexistent. The map improves with the scientific progress and is perfect when the genomic DNA sequencing of the species has been completed.
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- Quantitative trait locus. A quantitative trait locus (QTL) is a section of DNA (the locus) that correlates with variation in a phenotype (the quantitative trait). The QTL typically is linked to, or contains, the genes that control that phenotype.
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Allele (genetics) One member of a pair (or any of the series) of genes occupying a specific spot on a chromosome (called locus) that controls the same trait. Supplement. For example, a pair of alleles controlling the same trait, i.e. eye color: one allele codes for blue eyes, another allele for brown eyes. In humans, simple traits such as eye color may be caused by the interaction of only one pair of alleles.
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- Allele. Definition. noun, plural: alleles. (genetics). One member of a pair (or any of the series) of genes occupying a specific spot on a chromosome (called locus) that controls the same trait. Supplement.For example, a pair of alleles controlling the same trait, i.e. eye color: one allele codes for blue eyes, another allele for brown eyes.In humans, simple traits such as eye color may be caused by the interaction of only one pair of alleles.or example, a pair of alleles controlling the same trait, i.e. eye color: one allele codes for blue eyes, another allele for brown eyes. In humans, simple traits such as eye color may be caused by the interaction of only one pair of alleles.
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Gene A gene is a locus (or region) of DNA which is made up of nucleotides and is the molecular unit of heredity. The transmission of genes to an organism's offspring is the basis of the inheritance of phenotypic traits. Most biological traits are under the influence of polygenes (many different genes) as well as the gene–environment interactions.
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- Full Definition of LOCUS. 1. 2. : the set of all points whose location is determined by stated conditions. 3. : the position in a chromosome of a particular gene or allele. See locus defined for English-language learners. See locus defined for kids.
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Words near gene in the dictionary The definition of a gene is a unit on a chromosome that determines a specific trait in an organism, or a male's name. 1  An example of a gene is a chromosome unit that determines a person's eye color.  An example of a man named Gene is the actor Gene Wilder.
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- Locus. From Latin: locus - place. Definition: A shape created by the set of points whose position satisfies a given set of rules. Try this In the figure below, the small gray dots represent all the possible points on the plane.
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Loci A locus is the specific physical location of a gene or other DNA sequence on a chromosome, like a genetic street address. The plural of locus is loci.
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Quantitative trait locus A quantitative trait locus (QTL) is a section of DNA (the locus) that correlates with variation in a phenotype (the quantitative trait).The QTL typically is linked to, or contains, the genes that control that phenotype. quantitative trait locus (QTL) is a section of DNA (the locus) that correlates with variation in a phenotype (the quantitative trait).
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locus locus. 1  A place or locality, especially a centre of activity or the scene of a crime. The cafeteria was the locus of activity. ( 2 mathematics) The set of all points whose coordinates satisfy a given equation or condition. A circle is the locus of points from which the distance to the center is a given value, the radius.