A pattern of inheritance in which the transmission of a dominant allele on an autosome causes a trait to be expressed.
(In contrast, autosomal recessive diseases require that the individual have two copies of the mutant gene.) Individuals with autosomal dominant diseases have a 50-50 chance of passing the mutant gene and therefore the disorder on to each of their children.  (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. 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. Also, 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. 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. If both parents are carriers, there is a 25% chance of a child inheriting both abnormal genes and, consequently, developing the disease. In genetics, referring to that allele of a gene that is not express ed in the phenotype when the dominant allele is present. Also refers to the phenotype of an individual (homozygote) carrying two recessive alleles. (Figure 8-1) ... Locus: the particular position on homologous chromosomes of a gene. ~ Refers to an allele of a gene that is express ed when the dominant allele is not present. An allele express ed only in homozygous form, when the dominant allele is absent. Of or relating to a trait that is expressed only when the determining allele is present in the homozygous condition. n. Genetics. 1. A recessive allele or trait. 2. An organism having a recessive trait. 2. Genetics. a. pertaining to the allele of a gene pair whose effect is masked by the second allele when both are present in the same cell or organism. b. of or pertaining to the hereditary trait determined by such an allele. 3. Genetics. Compare dominant (def. 6). a. the recessive allele of a gene pair. autosomal inheritance, a pattern of inheritance in which the transmission of traits depends on the presence or absence of certain alleles on the autosomes. The pattern may be dominant or recessive, and males and females are usually affected with equal frequency. The majority of hereditary disorders are the result of a defective gene on an autosome. Kinds of autosomal inheritance are autosomal-dominant inheritance and autosomal-recessive inheritance.  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. ~ Refers to an allele of a gene that is express ed when the dominant allele is not present. An allele express ed only in homozygous form, when the dominant allele is absent. ~. A genetic trait that is not express ed in a heterozygous or partially heterozygous cell 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. Also, 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. autosomal-dominant inheritance, a pattern of inheritance in which the transmission of a dominant allele on an autosome causes a trait to be expressed. Males and females are usually affected with equal frequency.
http://www.medicinenet.com/script/main/art.asp?articlekey=11974 http://www.biology-online.org/dictionary/Recessive https://en.wikipedia.org/wiki/Autosomal_dominant_inheritance http://www.medicinenet.com/script/main/art.asp?articlekey=15971 http://en.mimi.hu/biology/recessive.html http://www.thefreedictionary.com/recessive http://medical-dictionary.thefreedictionary.com/autosomal+inheritance http://en.mimi.hu/biology/recessive.html https://en.wikipedia.org/wiki/Autosomal_dominant_inheritance http://medical-dictionary.thefreedictionary.com/autosomal-dominant+inheritance
autosomal dominant definition biology