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Topic: Dominant gene


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In the News (Sat 20 Jul 19)

  
  Dominant gene - Wikipedia, the free encyclopedia
In genetics, the term dominant gene refers to the allele that causes a phenotype that is seen in a heterozygous genotype.
A dominant gene when written in a genotype is always written before the recessive gene in a heterozygous pair.
Incomplete dominance occurs when certain of the recessive gene appears within the phenotype of the organism, causing a blend in between both the dominant and recessive gene.
en.wikipedia.org /wiki/Dominant_gene   (345 words)

  
 Recessive gene - Wikipedia, the free encyclopedia
Technically, the term "recessive gene" is imprecise because it is not the gene that is recessive but the phenotype (or trait).
This suggests that the dominant phenotype is dependent upon having two dominant genes and the presence of one dominant and one recessive gene creates some blending of both dominant and recessive traits.
Recessive genes are usually represented by a lowercase letter in a Punnett square, as opposed to the uppercase letters of dominant genes (see example at right).
en.wikipedia.org /wiki/Recessive_gene   (771 words)

  
 discussion of the genetic inheritance of curly hair in horses
The expressed allele in a heterozygous pair is known as the dominant allele, the unexpressed one as the recessive allele.
The term dominant is given an allele only to describe its relationship to related alleles, and is not to be taken as an indication of any kind of physical or temperamental strength of the allele or the animal possessing it.
- Heterozygous dominant curly and homozygous recessive curly.
www.curlyhorses.org /allele.html   (699 words)

  
 The Basics on Genes and Genetic Disorders
Genes are sections or segments of DNA that are carried on the chromosomes and determine specific human characteristics, such as height or hair color.
Dominant genes show their effect even if there is only one copy of that gene in the pair.
If a person carries the dominant gene for a disease, he or she will usually have the disease and each of the person's children will have a 1 in 2 (50%) chance of inheriting the gene and getting the disease.
kidshealth.org /teen/your_body/health_basics/genes_genetic_disorders.html   (1376 words)

  
 Recessive and Dominant Gene Action   (Site not responding. Last check: 2007-10-21)
If the gene is defective (usually recessive genes are defective, but not always) the right protein will not be made and the structure will either be defective and won't work at all or there won't be enough to maintain the structure.
So think of dominant and recessive genes in terms of what they produce and what that protein is supposed to do and then think of what would happen if the dominant gene was able to overtake the effect of the recessive gene.
That gene is causing a disease that is inherited in a dominant form.
www.newton.dep.anl.gov /askasci/bio99/bio99691.htm   (520 words)

  
 Biology 115L Project - 'The Gene Machine!'   (Site not responding. Last check: 2007-10-21)
Humans posses several single-gene traits ("phenotypes") where there are only two "alleles" (different forms of the same gene, located in the same place on the DNA strand) for that gene, and the gene behaves in a "dominant" fashion.
The reason I must know about your parents is that when a particular gene has a dominant allele, a person with a genotype with one allele of the dominant gene will have the same phenotype as a person with two copies of the dominant allele.
The genotypes of the parents are shown on the outside of the grid, and the possible combinations resulting from those alleles are shown on the inside of the square.
www.sonic.net /~nbs/projects/bio115l   (376 words)

  
 Coat Color Genetics
In any animal expressing the dominant allele of a gene, it cannot be determined by looking at the animal whether the second allele is a dominant or a recessive one.
The presence of a recessive allele may be masked by a dominant allele, which leads to the expression "hidden recessive." Dominant alleles are never hidden by their related recessive alleles.
This gene and the gene G, to be discussed in the next section, will be presented first because they have alleles whose actions can obscure the actions of the other coat color genes.
www.vgl.ucdavis.edu /~lvmillon/coatcolor/coatclr3.html   (3980 words)

  
 MENDELIAN PATTERNS OF INHERITANCE
Genes are submicroscopic segments of DNA and cannot be detected by chromosome analysis.
For autosomal dominant traits, the term "penetrance" refers to the number of gene carriers who are affected, divided by the total number of gene carriers who are affected and unaffected.
A recessive gene in a carrier female is occasionally expressed due to the inactivation of a significant number of the X chromosomes containing the normal gene.
www.usd.edu /med/som/genetics/curriculum/1FMENDL4.htm   (4122 words)

  
 AZ Genetics / Genetics Primer
A recessive gene is one that must be present in a pair (that is, on both sides of the locus) to be expressed in the offspring.
When there is a dominant gene on one side of the locus and a recessive gene on the other side, the dominant gene is the trait that is expressed.
In this case, the dominant gene is not able to fully suppress the effects of the recessive gene.
www.arihood.com /azgenetics/genprimr2.html   (580 words)

  
 An Untitled Web Page   (Site not responding. Last check: 2007-10-21)
In German Shepards, the drooping ear trait is due to a dominant gene, while erect ears is due to a recessive allele.
The genes for vine height is on a different pair of chromosomes than the gene for pea coat.
There is one gene for yellow fur and one gene for fl fur, but the heterozygote has a peculiar mixture of both colors called tortoise shell.
pages.cthome.net /apbio/GENEPR.HTM   (1316 words)

  
 NIH - Glossary
Autosomal dominant disorders are produced by a single mutated dominant allele, even though its corresponding allele is normal.
The sequence of the amino acidsÑand thus the function of the proteinÑis determined by the sequence of the base pairs in the gene that encodes it.
an inherited disease of infancy characterized by profound mental retardation and early death; it is caused by a recessive gene mutation.
www.accessexcellence.org /AE/AEPC/NIH/gene27.html   (1653 words)

  
 Investigating Heredity   (Site not responding. Last check: 2007-10-21)
Genes are carried on chromosomes that are found in the nucleus of every cell.
They only appear when there is no dominant gene there to attack them therefore to have a recessive trait the gene must have 2 recessive weak genes.
This was excellent the person that played the dominant gene pretended to step on the recessive gene or the recessive gene was scared of the dominant gene and went away.
www.auburn.edu /academic/classes/cte/403/sp1lehn.htm   (2098 words)

  
 autosomal   (Site not responding. Last check: 2007-10-21)
The inheritance of genetic diseases, abnormalities, or traits is described by both the type of chromosome the abnormal gene resides on (autosomal or sex chromosome) and by whether the gene itself is dominant or recessive.
Dominant inheritance occurs when an abnormal gene from one parent is capable of causing disease even though the matching gene from the other parent is normal.
Huntington disease is inherited as an autosomal dominant condition, this means the gene involved is on an autosomal chromosome (not one of the sex chromosomes) and recently has been localized on the fourth autosomal chromosome pair (the #4 chromosome).
bioinf.may.ie /degree/lectures/first/autosomal.html   (3003 words)

  
 Science Connection - Heredity and Genetics   (Site not responding. Last check: 2007-10-21)
Certain genes are dominant, and you only need one of the pair to give you its trait.
If you don't have a dominant gene, then you are recessive for that trait.
Dominant genes are represented as capital letters and recessive genes as lower-case letters.
student.biology.arizona.edu /sciconn/heredity/worksheet_heredity.html   (422 words)

  
 My Understanding of Coat Color Genetics in Dogs With A Special Emphasis on Anatolian Shepherd Guardian Dogs
The members of the set of genes that could possibly occupy a specific locus are called alleles of that locus; alleles are all alternate gene possibilities found at identical loci on the chromosomes.
This mutation was referred to as dominant fl because it was believed to be the dominant allele at the "E" Locus.
Polygenes are a set of gene alleles scattered over a number of different loci (rather than found only at one gene locus), and all working together to create a specific characteristic in the animal.
www.luckyhit.net /coatcolo.htm   (9620 words)

  
 Basic Genetics
This pair of genes can be either homozygous meaning that both of the genes in the pair are identical or heterozygous meaning that the two genes are different.
Dominant and recessive DO NOT mean "good" and "bad." In fact, many desirable traits in Great Danes are the result of recessive genes.
The usual convention is to have the dominant gene capitalized, with recessive genes in lower case letters.
www.dogstuff.info /greatdane_genetics.html   (3823 words)

  
 New England Reptile Distributors, designer Ball Pythons, Reticulated Pythons, and much more!
genes works in essentially the same manner as genetic inheritance in simple recessive genes, except for the fact that heterozygous animals are visibly different than normals.
One advantage of a co-dominant gene is that we are able to identify the heterozygous and homozygous gene carriers by their physical appearance; these animals will be visibly different from the normal (or wild-type) offspring.
This list is not all-inclusive, but intended to give an idea of co-dominant and dominant genes in the herp world, as well as some of the popular species in which they are more commonly found.
www.newenglandreptile.com /genetics_codom.html   (840 words)

  
 It Takes an Appaloosa to Produce an Appaloosa
The gene that determines the Appaloosa characteristics (Ap) is dominant.
You will know the dominant gene is present, even if on only ONE side of the chromosome, because it will be expressed (visible to the eye) in the outward appearance of the animal.
Should the color producing gene be on both sides of the chromosome as in Figure #4, this would be what we call totally dominant and consider pure.
barnlot.tripod.com /takesanappy.html   (558 words)

  
 Online Feline Fanciers: The Pigment Parade   (Site not responding. Last check: 2007-10-21)
Some are totally white (epistatic white gene), some have patches of white (the piebald gene), some have cute little white mittens and shoes (gloving),and some have no more than a few little hairs of white on their chests or tummies (lockets).
In this case, the dominant gene is extremely variable in its expression.
There has been theorized a "gloving" gene, but the hybridization of Birmans with other cats (both intentional and accidental) demonstrates that gloving is definitely caused by a dominant gene, not a recessive one, and pattern can be lost very easily, reintroducing a whole spectrum of distribution of white.
home.earthlink.net /~featherland/off/white.html   (2937 words)

  
 Recessive and Dominant Inheritance   (Site not responding. Last check: 2007-10-21)
Both parents carry a normal gene (N), and a faulty, recessive, gene (n).
The parents, although carriers, are unaffected by the faulty gene.
One parent has a single, faulty dominant gene (D), which overpowers its normal counterpart (d), affecting that parent.
www.accessexcellence.org /AB/GG/recessive.html   (83 words)

  
 The Stupid gene
A gene (actually, I think it's an allele, but lets stick with gene just for simplicity) can be either dominant or recessive.
When combined, the dominant gene will always be expressed (it will be the one that shows up.) For example, lets say the blue eye gene was recessive, and the brown eye gene was dominant.
The reason there are so many idiots on this planet is because the stupid gene is dominant and the smart gene is recessive.
www.angelfire.com /weird2/thestupidgene   (503 words)

  
 Things to Consider About Pedigrees   (Site not responding. Last check: 2007-10-21)
Single gene disorders are characterized by their pattern of transmission in families.
A gene is dominant if it is expressed in both the heterozygote and the homozygote.
In dominant gene disorders, the produce of the normal allele is typically one required in normal amounts.
www.runet.edu /~rsheehy/genetics/MM/Domrec.html   (1009 words)

  
 genetic terms
a gene that is always expressed, that is directly detectable in the individual
a gene that is only expressed when two identical copies coding for the same trait are present, one from the mother, one from the father
Blood type A gene is always expressed as either type A (or AB if the B gene is also present
www.drhull.com /EncyMaster/G/genetic_terms.html   (297 words)

  
 genome.gov | Talking Glossary: "dominant"
A gene that almost always results in a specific physical characteristic, for example, a disease, even though the patient's genome possesses only one copy.
With a dominant gene, the chance of passing on the gene (and therefore the disease) to children is 50-50 in each pregnancy.
Robert Nussbaum, of the National Human Genome Research Institute's Laboratory of Genetic Disease Research, defines dominant.
www.genome.gov /glossary.cfm?key=dominant   (78 words)

  
 Who has the most dominant GENE? - Guppies.com   (Site not responding. Last check: 2007-10-21)
WW is for the Wild Gene and is Dominant
guppyplace has a bit of info on dominant genes for the tai patterns, but thats all i've found so far.
The mosaic, for instance is dominant for the most part Large Spot =AA, Large Spot = Aa, Small spots aa and can be passed by both parents.
www.guppies.com /forums/showthread.php?t=570   (636 words)

  
 A&P 2 Genetics   (Site not responding. Last check: 2007-10-21)
one genes expression is inhibited by another’s expression
Genes on the same chromosome belong to the same linkage group
Linkage is the tendency of genes located on the same chromosome to be transmitted together in inheritance
www.northland.cc.mn.us /biology/AP2Campus/AP2notes/AP2geneticsnotes.htm   (1481 words)

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