recessive allele definition biology
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Biology Genetics (Theoretical Genetics) Recessive allele: an allele that only has an effect on the phenotype when present in the homozygous state. Codominant alleles: pairs of alleles that both affect the phenotype when present in a heterozygote. Locus: the particular position on homologous chromosomes of a gene.Homozygous: having two identical alleles of a gene. Heterozygous: having two different alleles of a gene. Carrier: an individual that has one copy of a recessive allele that causes a genetic disease in individuals that are homozygous for this allele.ocus: the particular position on homologous chromosomes of a gene. Homozygous: having two identical alleles of a gene. Heterozygous: having two different alleles of a gene. Carrier: an individual that has one copy of a recessive allele that causes a genetic disease in individuals that are homozygous for this allele.
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recessive recessive. 1  receding or tending to recede. 2  Genetics designating or relating to that one of any pair of allelic hereditary factors which, when both are present in the germ plasm, remains latent.
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- Definition of Recessive. Recessive: A condition that appears only in individuals who have received two copies of a mutant gene, one copy from each parent.The individuals with a double dose of the mutated gene are called homozygotes.here are two types of recessive diseases -- autosomal recessive and X-linked recessive -- that describe different patterns of inheritance. The opposite of recessive is dominant. See also Autosomal recessive; Dominant; and X-linked recessive.
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Allele: A Genetics Definition When the alleles of a pair are heterozygous, one may be dominant and the other recessive. The dominant allele is expressed and the recessive allele is masked. This is an example of complete dominance.hare. By Regina Bailey. Definition: An allele is an alternative form of a gene (one member of a pair) that is located at a specific position on a specific chromosome. These DNA codings determine distinct traits that can be passed on from parents to offspring through sexual reproduction.
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Dominance (genetics) Dominance in genetics is a relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus. The first allele is dominant and the second allele is recessive.For genes on an autosome (any chromosome other than a sex chromosome), the alleles and their associated traits are autosomal dominant or autosomal recessive. Dominance is a key concept in Mendelian inheritance and classical genetics.or example, if p is the frequency of allele A, and q is the frequency of allele a then the terms p 2, 2 pq, and q 2 are the frequencies of the genotypes AA, Aa and aa respectively. Since the gene has only two alleles, all alleles must be either A or a and p + q = 1.
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Dominance (genetics) Dominance in genetics is a relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus. The first allele is dominant and the second allele is recessive. For genes on an autosome, the alleles and their associated traits are autosomal dominant or autosomal recessive. Dominance is a key concept in Mendelian inheritance and classical genetics. Often the dominant allele codes for a functional protein whereas the
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Dominance (genetics) For genes on an autosome (any chromosome other than a sex chromosome), the alleles and their associated traits are autosomal dominant or autosomal recessive. Dominance is a key concept in Mendelian inheritance and classical genetics.ominance in genetics is a relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus.
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Dominance (genetics) The first allele is dominant and the second allele is recessive. For genes on an autosome (any chromosome other than a sex chromosome), the alleles and their associated traits are autosomal dominant or autosomal recessive. Dominance is a key concept in Mendelian inheritance and classical genetics.lso, an allele may be dominant for a particular aspect of phenotype but not for other aspects influenced by the same gene. Dominance differs from epistasis, a relationship in which an allele of one gene affects the expression of another allele at a different gene.
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recessive noun. The definition of recessive is going back to a former state. An example of something recessive is a third grade student doing first grade math. Recessive is defined as a gene with characteristics which are not as strong as those on a dominant gene. An example of a recessive is the gene for blue eyes.
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Recessive trait Recessive trait. Definition. noun. (genetics) A genetic trait that results from the expression of the two recessive alleles. Supplement. When the dominant allele is lacking or when the two alleles present are both recessive, their expression results in a recessive trait. Also called: 1  recessive character.
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RECESSIVE ALLELE Hypernyms (recessive allele is a kind of...): allele; allelomorph (either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character).
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Homozygous Recessive: Definition & Disorders Most plants and most animals-including you, if you're human-have two copies of each of their genes. If both copies are identical, we say that individual is homozygous for that gene. A recessive gene is one that has to be homozygous to have an effect on the plant's or animal's traits. If you have a lab rat with a dominant gene, you'll see its effect whether the rat has one copy of the gene or two.
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What is a Recessive Trait? A recessive trait is a trait caused by a recessive gene, which means that someone must inherit two copies of the gene for the trait to manifest. By contrast, a dominant trait only requires one copy of the gene.The concept of dominant and recessive traits in genetics was put forward by Gregor Mendel, a 19th century scientist who is often regarded as the father of genetics, thanks to his extensive work in the field.regor Mendel, the father of genetics, first proposed the concept of dominant and recessive traits. The gene responsible for blue eyes is recessive. Blonde hair color is recessive, but it can be passed on in the absence of a dominant trait. Red hair is a recessive trait.
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Genetics Terms The characteristic that occurs when its presence determines the phenotype only when both alleles are the same. In a heterozygous individual, the effect of a recessive allele is hidden. For example, if T and t are two alleles of a gene, t is recessive if Tt individuals are phenotypically different to tt individuals. Or, to put it another way, a phenotype is recessive when it is only present in a homozygous individual.
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recessive Definition of recessive. 1  1a : tending to recedeb : withdrawn 2. 2  2a : producing little or no phenotypic effect when occurring in heterozygous condition with a contrasting allele recessive genesb : expressed only when the determining gene is in the homozygous condition recessive traits a recessive disease.
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Recessive Trait: Definition & Example Normally, individuals have two alleles for one gene. A dominant allele is usually designated by an uppercase letter and masks the effects of another allele, the recessive allele. Recessive alleles are normally represented by lowercase letters and is - as you can no doubt guess - the non-dominant allele.
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ALLELE • RECESSIVE (noun). The noun RECESSIVE has 1 sense: 1. an allele that produces its characteristic phenotype only when its paired allele is identical. Familiarity information: RECESSIVE used as a noun is very rare. RECESSIVE (noun). The noun RECESSIVE has 1 sense: 1. an allele that produces its characteristic phenotype only when its paired allele is identical. Familiarity information: RECESSIVE used as a noun is very rare.
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Dominance (genetics) Dominance in genetics is a relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus. The first allele is dominant and the second allele is recessive. For genes on an autosome (any chromosome other than a sex chromosome), the alleles and their associated traits are autosomal dominant or autosomal recessive. Dominance is a key concept in Mendelian inheritance and classical genetics. Often the dominant allele codes for a functional protein whereas the recessive allele does not. A classic example of dominance is the inheritance of seed shape, for example a pea shape in peas.
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Medical Definition of Recessive, autosomal Autosomal recessive: A genetic condition that appears only in individuals who have received two copies of an autosomal gene, one copy from each parent. The gene is on an autosome, a nonsex chromosome.The parents are carriers who have only one copy of the gene and do not exhibit the trait because the gene is recessive to its normal counterpart gene.he gene is on an autosome, a nonsex chromosome. The parents are carriers who have only one copy of the gene and do not exhibit the trait because the gene is recessive to its normal counterpart gene.
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- Biology Glossary search by EverythingBio.com. An allele that expresses its phenotypic effect even when heterozygous with a recessive allele; thus if A is dominant over a, then AA and Aa have the same phenotype. 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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Recessive (genetics) Of, or pertaining to, a gene (or allele) whose phenotypic expression is masked by a dominant gene (or allele). noun. (1) A recessive allele or trait. (2) An organism whose recessive trait is discernible or expressed.Supplement. In genetics, a recessive gene or allele is one in which the effect is not tangible, or is masked by the effects of the dominant gene.The recessive trait may be expressed when the recessive genes are in homozygous condition or when the dominant gene is not present.That happens when an organism inherits a pair of recessive genes from its parents. Word origin: Latin recess(us) , a withdrawal, receding part + - ive.he recessive trait may be expressed when the recessive genes are in homozygous condition or when the dominant gene is not present. That happens when an organism inherits a pair of recessive genes from its parents.
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Allele: A Genetics Definition Definition: An allele is an alternative form of a gene (one member of a pair) that is located at a specific position on a specific chromosome. These DNA codings determine distinct traits that can be passed on from parents to offspring through sexual reproduction.hen the alleles of a pair are heterozygous, one may be dominant and the other recessive. The dominant allele is expressed and the recessive allele is masked.
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Recessive Trait: Definition & Example A recessive trait is the phenotype that is seen only when a homozygous recessive genotype for the trait of interest is present. This means that an individual must have two recessive alleles for the gene that determines this trait of interest. recessive trait is the phenotype that is seen only when a homozygous recessive genotype for the trait of interest is present. This means that an individual must have two recessive alleles for the gene that determines this trait of interest.
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- Recessive trait. Definition. noun. (genetics) A genetic trait that results from the expression of the two recessive alleles. Supplement. When the dominant allele is lacking or when the two alleles present are both recessive, their expression results in a recessive trait.Also called: 1  recessive character.oun. (genetics) A genetic trait that results from the expression of the two recessive alleles. Supplement. When the dominant allele is lacking or when the two alleles present are both recessive, their expression results in a recessive trait. Also called: 1  recessive character.