Genotype
gale
views updated May 18 2018GENOTYPE
The term "genotype" refers to the specific genetic makeup of an individual and is often used with reference to allelic or mutant differences between individuals at one or more genes. The genotype of an individual is the genetic information within an individual's specific DNA sequence that sets the limits upon which nongenetic parameters like environment modulate normal and abnormal phenotypes. Geno-types at specific genes known to cause birth defects are used as diagnostics in genetic counseling to identify parents carrying specific disease genes and in prenatal genetic testing for offspring that will have birth defects. For example, a description of a mutation within the gene that causes cystic fibrosis is a geno-type, while manifestation of the disease is the pheno-type. The results of the Human Genome Project are being used to identify DNA sequences that cause birth defects. The genotypes associated with birth defects are then available for development of more accurate diagnostic tests.
See also:GENETIC COUNSELING; HUMAN GENOME PROJECT
Bibliography
Oak Ridge National Laboratory. "The Science behind the Human Genome Project." Available from http://www.ornl.gov/hgmis/project/info.html; INTERNET
David W.Threadgill
Robert E.Boykin
Child Development
genotype
oxford
views updated May 17 2018gen·o·type / ˈjenəˌtīp; ˈjē-/ •
n. Biol. the genetic constitution of an individual organism. Often contrasted with phenotype.• v. [tr.] investigate the genetic
constitution of (an individual
organism): the person appointed will be responsible for maintaining and genotyping many different lines of zebra fish. DERIVATIVES: gen·o·typ·ic / ˌjenəˈtipik; ˌjē-/ adj.
The Oxford Pocket Dictionary of Current English
genotype
oxford
views updated May 11 2018genotype The genetic constitution of an organism, as opposed to its physical appearance (
phenotype). Usually this refers to the specific
allelic composition of a particular
gene or set of genes in each cell of an organism, but it may also refer to the entire
genome.
A Dictionary of Plant Sciences MICHAEL ALLABY
genotype
oxford
views updated May 14 2018genotype The total set of
alleles possessed by an organism. (Alleles are genes, which may be different or identical, that occupy matching sites on each of a pair of chromosomes.) Expression of these is responsible for the
phenotype of the individual, which can be modified by environmental pressures.
Alan W. Cuthbert
See
genetics, human;
phenotype.
The Oxford Companion to the Body COLIN BLAKEMORE and SHELIA JENNETT
genotype
oxford
views updated May 23 2018genotype The genetic constitution of an organism, as opposed to its physical appearance (
phenotype). Usually this refers to the specific allelic composition of a particular gene or set of genes in each cell of an organism, but it may also refer to the entire
genome.
A Dictionary of Ecology MICHAEL ALLABY
genotype
oxford
views updated Jun 11 2018genotype The genetic constitution of an organism, as opposed to its physical appearance (phenotype). Usually this refers to the specific allelic composition of a particular
gene or set of genes in each cell of an organism, but it may also refer to the entire
genome.
A Dictionary of Zoology MICHAEL ALLABY
genotype
oxford
views updated May 11 2018genotype (jen-oh-typ) n. 1. the genetic constitution of an individual or group, as determined by the particular set of genes it possesses.
2. the genetic information carried by a pair of alleles, which determines a particular characteristic. Compare
phenotype.
A Dictionary of Nursing
genotype
oxford
views updated Jun 27 2018genotype Genetic makeup of an individual. The particular set of
genes present in each cell of an organism is distinct from the
phenotype, the observable characteristics of the organism.
World Encyclopedia
genotype
oxford
views updated May 14 2018genotype The genetic composition of an organism, i.e. the combination of
alleles it possesses. Compare
phenotype.
A Dictionary of Biology
genotype
oxford
views updated May 08 2018genotype Genetic constitution of an organism, as opposed to its physical appearance (
phenotype).
A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY