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Topic: Dominant allele

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allele frequencies

genetic alleles

frequency distribution of alleles

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	Dominant gene Summary
		The allele not expressed in the heterozygous form is said to be recessive to the masking allele, the dominant allele.
		For example, with the pea plants studied by Austrian botanist Gregor Johann Mendel, the allele for tall plants was dominant to the allele for dwarf plants.
		In genetics, the term dominant gene refers to the allele that causes a phenotype that is seen in a heterozygous genotype.
	www.bookrags.com /Dominant_gene (865 words)

	Allele - Wikipedia
		An allele is any one of a number of alternative forms of the same gene occupying a given locus (position) on a chromosome.
		An organism in which both copies of the gene are identical - that is, have the same allele - is said to be homozygous for that gene.
		A wild type allele is an allele which is considered to be "normal" for the organism in question, as opposed to a mutant allele which is usually a relatively new modification.
	www.web-dictionary.org /encyclopedia/al/Allele.html (285 words)

	Allele - Wikipedia
		An allele is any one of a number of alternative forms of the same gene (sometimes the term refers to a non-gene sequence) occupying a given locus (position) on a chromosome.
		One exception is incomplete dominance (sometimes called blending inheritance) when alleles blend their traits in the phenotype.
		Another exception is co-dominance, where both alleles are active and both traits are expressed at the same time; for example, both red and white petals in the same bloom or red and white flowers on the same plant.
	en.wikipedia.org /wiki/Allele (468 words)

	Bella's Colour Genetics - basic genetics
		This means that an individual with one dominant and one recessive allele will have the same characteristics as an individual with two copies of the dominant allele.
		An allele on one locus is epistatic to another locus if it overrides the effects of the alleles on the other locus.
		For instance, in the S-series the allele for normal pigmentation (S) is the "wild-type" allele, while the allele for entirely white coat (s) is a mutant verison of the S-allele which prevents the formation of pigment.
	www.bellasgenetik.se /eng_genetics_basics.htm (888 words)

	Evolution (Site not responding. Last check: 2007-10-20)
		The allele frequency of the recessive the square root of the genotype frequency, or a =.01.
		The recessive allele (9which in the case of PKU is strongly selected against), however, would be present and protected, in 2% of the population.
		Dominance status: A deleterious dominant allele can be eliminated completely but recessives persist virtually indefinitely in the population because they are sequestered by diploidy in the heterozygote.
	www.lander.edu /rsfox/evol111.html (11536 words)

	Geneinfo - Patterns of inheritance
		A recessive allele on the X chromosome does not influence the phenotype in females if it is present in only one copy, because there is a second copy to block it.
		The parents' alleles are listed on the sides of the box, and all the possible combinations of alleles for the children are listed in the compartments of the box.
		While the model of dominant and recessive alleles is useful for understanding many traits that are determined by a single gene, most human characteristics are actually determined by interactions between many genes, as well as environmental factors.
	www.geocities.com /geneinfo/concepts/inheritedfr.html (1141 words)

	Genetics and Inheritance
		An allele that can be suppressed during a generation is called a recessive allele, while one that is consistently expressed is a dominant allele.
		Mendel observed that although the dominant trait was the one expressed in the F1 generation, the recessive trait still had an effect on the genotype of a heterozygote's offspring.
		Neurofibromatosis or NF is an autosomal dominant trait.
	www.dartmouth.edu /~cbbc/courses/bio4/bio4-lectures/Genetics.html (3597 words)

	B/b, E/e, and Beyond
		Therefore, although the "e" allele provides the basis by which the yellow color is apparent, the actual yellow appearance is dependent on the alleles present at both the A locus and the C locus.
		Crossbreeding to breeds that carry the "wild-type" extension allele (E+) as well as the possibility of a spontaneous mutation resulting in a "gain of function" (also denoted E+) of the Mc1 receptor encoded by the recessive "e" allele, may be possible explanations for color oddities occurring in the breed.
		This allele would explain the silver-toned modification of coat observed in yellow Labs in the presence of the recessive "e" allele, however it would not explain the eumelanin modification in the fl or chocolate-based silvers (since the C locus alleles primarily dilute phaeomelanin).
	labbies.com /genetics2.htm (6627 words)

	Evolution: Glossary
		The allele (a) does not influence the heterozygote's phenotype and is called recessive.
		An allele may be partly, rather than fully, dominant; in that case, the heterozygous phenotype is nearer to, rather than identical with, the homozygote of the dominant allele.
		It is the multi-locus analog of an allele.
	www.pbs.org /wgbh/evolution/library/glossary/index.html (13323 words)

	[No title]
		For any given trait R where allele R is dominant over allele r, the probability of getting a gamete with the r allele is a.
		In a particular individual the genes on one chromosome are A B C (dominant) and on the homologous chromosome a b c (recessive).
		The combination of the seed shape (R,r: alleles for round or wrinkled seeds) and color (Y,y: alleles for yellow or green seeds) are found in two pea plants.
	www2.uwsuper.edu /rseelke/exams/genetics/exam1all.txt (5468 words)

	MSN Encarta - Evolution
		If a child inherits the allele for tongue rolling from one parent and the allele for no tongue rolling from the other parent, she will be able to roll her tongue.
		The allele for tongue rolling dominates the gene pair, and so its trait is expressed.
		According to the laws governing heredity, when a dominant allele (in this case, tongue rolling) and a recessive allele (no tongue rolling) combine, the trait will always be dictated by the dominant allele.
	encarta.msn.com /encyclopedia_761554675/Evolution.html (1780 words)

	CIDD- Introduction
		P represents the dominant allele, and p the recessive allele.
		Since PRA is a recessive trait, p is the affected allele, and P the normal allele.
		The parent with the dominant trait will pass the affected gene to approximately half its offspring, and the trait will be apparent in both the parent and the affected progeny.
	www.upei.ca /~cidd/howare.htm (1647 words)

	Mendel and the Gene Idea (Site not responding. Last check: 2007-10-20)
		An homologous allele that fails to have an impact on phenotype when paired with a dominant allele is said to be recessive
		a is the abbreviation for the recessive allele
		A is the abbreviation for the dominant allele
	www.mansfield.ohio-state.edu /~sabedon/campbl14.htm (1242 words)

	Classical Genetics Lectures (Site not responding. Last check: 2007-10-20)
		The purple allele is dominant to the white allele, p.
		We refer to the totality of alleles in a population as the gene pool and that of an individual as the genome.
		In the case of complete dominance you cannot distinguish between homozygous dominants and heterozygotes so the two are lumped together in the 3 of the 3:1 ratio.
	www.lander.edu /rsfox/genclass.html (8162 words)

	Snow Genes
		In the Bengal breed, this is the allele responsible for the seal sepia and seal mink (which have the gold to green eyes also) "snow" Bengals.
		This allele produces a moderate albinism, reducing the basic coat color from fl/brown to a light beige with dark brown "points" in the classic Siamese pattern and producing bright blue eyes.
		This is the allele responsible for the seal lynxpoint (and blue-eyed) "snow" Bengals.
	www.exoticsnowbobs.com /snow_genes.htm (558 words)

	[No title]
		BSUM Brief Summary This invention relates to a novel allele which determines color in the bel l pepper Capsicum annuum L. The novel allele is a dominant orange allele.
		This dominant allele for orange color imparts a mature fruit color which is between "medium orange" and "light red", and is illustrated in FIG.
		In addition, line `434` may be used as a source of the dominant orange allele and this allele can be transferred using known breeding protocols (such as backcrossing) to other pepper breeding lines.
	www.nal.usda.gov /pgdic/germplasm/patents/1995_Patents/05440069 (1664 words)

	Intro to Genetics
		Dominant traits were defined by Mendel as those which appeared in the F1 generation in crosses between true-breeding strains.
		Dominant alleles are those that show up in the next generation in crosses between two different "true-breeding strains".
		Usually homozygous dominant and heterozygous individuals have identical phenotypes (although their genotypes are different).
	www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookgenintro.html (2465 words)

	Dominant vs. Recessive Traits
		The gene of the unexpressed allele is not transcribed and translated.
		The expressed gene is said to be dominant over the unexpressed gene, which is described as recessive.
		If blue eyes is the dominant trait, the person will have blue eyes when both or either one of his alleles for eye color is blue, because the dominant allele will always be expressed instead of the recessive alleles.
	library.thinkquest.org /C0118084/Gene/Genetic_variation/dominant_recessive.htm (299 words)

	Genetics Resources: Basics - Autosomal Dominant Inheritance
		Autosomal dominant inheritance refers to a dominant allele being passed on from parent to child on any chromosome other than the X or the Y. An allele is a âversionâ of a gene.
		If the dominant allele has a mutation, the result of that mutation will be expressed, even if the partner allele does not have a mutation.
		Since autosomal dominant conditions are rare, it is unlikely that a person would be homozygous (have a mutation in both copies) for a dominant allele; it is much more likely for a person to be an affected heterozygote (have only one mutation).
	www.slh.wisc.edu /wps/wcm/connect/extranet/genetics/basics_dominant.html (1017 words)

	Horse Tests - Coat Color
		White spotting patterns on the base coat color are produced by the Dominant White (one big spot), Appaloosa, Tobiano and Overo genes or as mixed white and colored hair patterns produced by the Grey (progressive whitening with age) and Roan genes.
		The dominant allele A restricts fl pigment to the points of the horse (mane, tail, lower legs and ear rims), as seen, for example, in bays and buckskins.
		Sabino1 is inherited as an autosomal dominant mutation.
	www.vgl.ucdavis.edu /service/horse/coatcolor.html (2308 words)

	Philpott, Caroline C - The toxicity of AFT1-1up, a dominant mutant allele of an iron regulator, is enhanced by deletion ... (Site not responding. Last check: 2007-10-20)
		Philpott, Caroline C - The toxicity of AFT1-1up, a dominant mutant allele of an iron regulator, is enhanced by deletion of RAD52 in yeast.
		The toxicity of AFT1-1up, a dominant mutant allele of an iron regulator, is enhanced by deletion of RAD52 in yeast.
		We report an intersection of these two pathways in which the iron-dependent toxicity of a dominant mutant allele of an iron regulator is enhanced by the deletion of the double strand break repair gene, RAD52.
	www.yeastgenome.org /yeast96/f2177.html (300 words)

	GENETICS (Site not responding. Last check: 2007-10-20)
		There are usually at least two forms (called alleles) of most genes, and the effect they have when expressed in the individual, i.e.
		alleles show their effect whether there are one or two of them in a pair.
		Dominant alleles are written as a capital letter (H), and recessive alleles as a small (lower case) version (h) of the same letter.
	web.ukonline.co.uk /webwise/spinneret/genes/genetx.htm (1222 words)

	Dominance and Crossing Over (Site not responding. Last check: 2007-10-20)
		Mendel paved the way to discovering that alleles that code for a particular characteristic, such as the shape of the seeds produced are expressed in dominant and recessive genes.
		When dominant genes were present, they would supercede the presence of wrinkled and were deemed the dominant gene.
		All dominant genes are marked in red, and all recessive genes are marked in green.
	www.biology-online.org /2/4_crossing_over.htm (403 words)

	Mendelian Genetics-Punnett Square
		For example, given four offspring with heterozygous parents for a simple dominant trait, students will be able to predict that three of the offspring will express the dominant trait while the fourth expresses the recessive form of the gene.
		This means that the alleles contributed by the F1 parent are expressed in the testcross offspring.
		The phenotypic ratio of the testcross offspring is the same as the frequency of alleles; therefore, a heterozygote would yield two phenotypes and a homozygote would yield one phenotype.
	educ.queensu.ca /~science/main/concept/biol/b05/B05CDCG5.htm (1924 words)

	Botany online: Selection and Fitness - Mutation - Gene Flow - Recombination - Drift - Selection. (Site not responding. Last check: 2007-10-20)
		Ability of a recessive (upper part) and a dominant (lower part) allele to assert itself under the precondition that it has a selective advantage of 1 in 1,000 (s = 0.001).
		This means that in 90 percent of all possible cases, the allele is extinguished after 15 generations.
		An advantageous dominant allele spreads very fast, while recessive alleles have an only low ability to assert themselves even if they provide a selective advantage.
	www.biologie.uni-hamburg.de /b-online/e40/40d.htm (678 words)

	A semi-dominant allele, niv-525, acts in trans to inhibit expression of its wild-type homologue in Antirrhinum majus -- ... (Site not responding. Last check: 2007-10-20)
		A semi-dominant allele, niv-525, acts in trans to inhibit expression of its wild-type homologue in Antirrhinum majus -- Coen and Carpenter 7 (4): 877 -- The EMBO Journal
		A semi-dominant allele, niv-525, acts in trans to inhibit expression of its wild-type homologue in Antirrhinum majus
		Niv-525 is a semi-dominant allele of the nivea locus, which encodes the
	embojournal.npgjournals.com /cgi/content/abstract/7/4/877 (241 words)

	Test Mating for Absence of Dominant Black Allele (Site not responding. Last check: 2007-10-20)
		Hebridean sheep are fl because they are homozygous recessive for a fl allele at one of the two loci for colour genes in sheep - the A locus.
		When present, this dominant fl allele would mask the effects of the presence of the normally dominant white allele, which resides in sheep at the A locus, and could also have entered the breed line by cross breeding.
		However, it is clear that if a ram was sold as "tested free of dominant fl allele" on the basis of corrupted evidence, the breeder would be liable to the purchaser for any losses which might ensue.
	www.btinternet.com /~hebridean.sheep/testmating.html (583 words)

	A putative Mutator-induced dominant amylose-extender mutant allele, Ae-5180
		In addition, a dominant dappled aleurone mutant arising in a Mutator population has been described by Stinard and Robertson (MNL 61:7), but has not yet been proven to have been induced by the Mutator system.
		In this paper we describe a dominant amylose-extender mutant which arose in a Mutator population.
		Kernels that are homozygous for the standard ae allele and homozygous for wx are smaller, more translucent, and have finer wrinkling than kernels that are homozygous for ae in a Wx background.
	www.maizegdb.org /mnl/62/20stinard.html (2439 words)

	Genetic Terms
		Dominant - An allele is dominant if it produces its own effect and hides the presence of another allele.
		Black is dominant to red, so you can't tell by looking if the dog has a copy of the red gene or not.
		The inheritance of a trait dependent on multiple genes is harder to predict than one based on a simple dominant/recessive relationship of alleles of the same gene.
	www.ashgi.org /color/genetic_terms.htm (455 words)

	Botany online: Classic Genetics - A Closer Scrutiny on Mendel's Laws - Mutations (Site not responding. Last check: 2007-10-20)
		is the specific combination of the alleles of a cell.
		is the totality of all alleles of a population.
		is an allele that determines the phenotype in a heterozygous condition.
	www.biologie.uni-hamburg.de /b-online/e10/10.htm (666 words)

	Chapter 9 - Patterns of Inheritance (Site not responding. Last check: 2007-10-20)
		When the genes of an allelic pair are different (not identical), 1 (the dominant gene) is fully expressed and the other (the recessive gene) has no noticeable effect on the individual's appearance.
		Homologous chromosomes have genes (alleles) for the same traits or characteristics located at the same positions (loci) along their lengths.
		(75% had 2 dominant traits and 14% had 2 recessive traits in stead of 56% with 2 dominant traits and 6% with 2 recessive traits exhibited in (9:3:3:1).
	www.selway.nic.edu /dacunnin/Biodistant/chapter9a.htm (1892 words)

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