Alleles

Another exception is "codominance", where both alleles are active and both traits are expressed; for example, both red and white petals. Codominance is also apparent in human blood types.
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multiple alleles
one of three or more alternative forms of allelic series that all map to a specific locus
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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alleles whose summed effect is that of lethality for example, four alleles each of which would be lethal 25% of the time (or to 25% of their bearers), are equivalent to one lethal allele.
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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Codominant alleles occur when rather than expressing an intermediate phenotype, the heterozygotes express both homozygous phenotypes. An example is in human ABO blood types, the heterozygote AB type manufactures antibodies to both A and B types.
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Alleles in genetic crosses are usually indicated by capital and lower case letters with dominant alleles designated by capitals and recessive alleles designated by lower case letters.
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Alleles: Alternative forms of a genetic characteristic.
Amino acids: Small molecules that form the building blocks of proteins.
Autosome: All chro mosomes except those involved in sex determination.
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alleles: different forms of the same gene.
alveoli: microscopic air sacs that are surrounded by a rich network of blood vessels in mammalian lungs that function in gas exchange; the air sacs are at the end of the bronchioles.
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Alleles
Alternative forms of a gene. For example, the mutants putA601 and putA736 each have a different mutation in the putA gene.
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Alleles alternate forms for genes
(allelo = one another parallel)
Allelopathy when plants secrete chemicals to retard/inhibit the growth of other plants
(allelo = one another parallel; pathos = disease suffering) ...
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Alleles and Loci
An allele is a gene that has more than one form. Each of the forms is referred to as an allele. For example, the gene for red flowers and the gene for white flowers are two different alleles.
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Alleles can increase or decrease in frequency due to drift. The average expected change in allele frequency is zero, since increasing or decreasing in frequency is equally probable.
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- Alleles
- Heterozygous
- Homozygous
- P generation
Definition: A plant, that when self-fertilized, only produces offspring with the same traits. The alleles for these type of plants are homozygous.
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Both alleles encode a PKG, a protein kinase (an enzyme that attaches phosphate groups to target proteins) that is activated by the "second messenger" cyclic GMP (cGMP) [More].
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When the alleles of a gene do not differ with regard to fitness, on average the number of carriers in one generation is proportional to the number of carriers in the last.
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multiple alleles A condition in which more than two alleles exist for a given trait.
multiple fission Asexual reproduction by the splitting of a cell or organism into many cells or organisms. See schizogony.
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Different alleles of a gene may perturb molecular aspects ofthese networked biosystems.
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All of the alleles available among the reproductive members of a population from which gametes can be drawn.
Related Terms: Allele ...
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2e- Inheritance of alleles from both parents
2g - Predicting genotype of offspring from parents.
Demonstrate how an organism's genotype depends on the genotype of its parents.
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The loss or gain of alleles from a population due to the emigration or immigration of fertile individuals, or the transfer of gametes, between populations.
gene pool
The total aggregate of genes in a population at any one time.
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(See Electrophoresis.) Alleles. Alternate forms of a gene or DNA sequence, which occur on either of two homologous chromosomes in a diploid organism. (See DNA polymorphism.) Alternative mRNA splicing.
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Dominant -- alleles that determine the phenotype displayed in a heterozygote with another (recessive) allele. Down syndrome -- a type of mental deficiency due to trisomy (three copies) of autosome 21, a translocation of 21 or mosaicism.
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Gene flow: the transfer of genes (actually, alleles) from one population to another.
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The three common apolipoprotein E (ApoE) alleles differentially contribute to the risk of Alzheimer's disease (AD).
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Genes determining Greek or Roman status are alleles of the same locus, the MAT locus.
Diploid cells resulting from the mating of Romans and Greeks do not make any pheromones or pheromone receptors.
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In cases of maternal effect, the transmission pattern of the alleles is the same as in standard Mendelian genetics but the action of the gene occurs a generation later.
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: The property possessed by some alleles of determining the phenotype for any particular gene by masking the effects of the other allele (when heterozygous). Thus,
homozygosity
or
heterozygosity ...
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Polygenic disorders: Genetic disorders resulting from the combined action of alleles of more than one gene (e.g., heart disease, diabetes, and some cancers).
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Different alleles produce variation in inherited characteristics such as hair color or blood type. In an individual, one form of the allele (the dominant one) may be expressed more than another form (the recessive one).
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Haplotype
The combination of alleles of different genes that are present in an individual.
Hybridization
The interbreeding of animals or plants of different species.
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Genotype. The genetic makeup of an organism, with respect to a given genetic locus, the alleles it carries
Genus. (plural: genera) The level of the taxonomic hierarchy above the species but below the family level ...
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The situation in which a heterozygote shows the phenotypic effects of both alleles fully & equally, (eg blood group antigens).
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during anaphase 1 of meiosis, producing gametes containing only one allele of each gene. Such an occurrence is the physical mechanism underlying the first law of Mendelian genetics and is particularly important when the two separated alleles are ...
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Used in detection of genetic disease alleles etc.
RT-PCR PCR amplification from an RNA template. The first step involves synthesis of a single strand of cDNA on the RNA template using reverse transcriptase.
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