Homozygous

homozygous
in a diploid organism, characterized by both alleles being the same at a specific locus
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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For example, the gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r). A homozygous plant would contain the following alleles for seed shape: (RR) or (rr).
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Dr. Robert Nussbaum, of the National Human Genome Research Institute's Laboratory of Genetic Disease Research, defines homozygous.
related
terms:
chromosome, gene, inherited ...
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Homozygous for the true-breeding trait. When selfing the trait will not segregate.
Related Terms: Homozygosity
The presence of the same alleles at one or more loci. Cf. homozygote ...
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Homozygous See: homozygote
Human artificial chromosome (HAC) A vector used to hold large DNA fragments.
See also: chromosome, DNA
Human gene therapy See: gene therapy ...
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homozygous Having identical alleles for a given gene.
hormones Chemical substances that are produced in the endocrine glands and travel in the blood to target organs where they elicit a response.
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Homozygous
A cell or organism where the same allele is carried by each member of a pair of homologous chromosomes.
Horseradish peroxidase
An enzyme that can be complexed to DNA for use in some non-radioactive DNA labeling procedures.
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homozygous
(home-oh-zy-gus)
Having two identical alleles for a given trait.
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homozygous: two identical alleles that are present for a particular characteristic.
hormones: biochemical substances produced within plant or animal cells, or glands, that exert a particular effect.
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homozygous mutants (which embryonic or larval lethality was rescued by a col transgene) completelely lacked the L3-L4 intervein (Fig 1b) and L3 & L4 each maintained its own identity, as shown by the presence of campaniform sensillae on L3, ...
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homozygous Having two identical alleles for a given trait.
hood Dorsal wall of the camerostome that extends over the capitulum.
horizons Soil zones from the surface downward that reveal visible horizontal layers of soil.
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Homozygous: An individual containing identical alleles for a given gene or locus.
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A homozygous dominant genotype occurs when a particular locus has two copies of the dominant allele (e.g., AA). A homozygous recessive genotype occurs when a particular locus has two copies of the recessive allele (e.g., aa).
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A homozygous dominant genotype occurs when a particular locus comprises two alleles for the dominant trait (e.g. AA). A homozygous recessive genotype occurs when a particular locus comprises two alleles for the recessive trait (e.g. aa).
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64% homozygous for BB (0.8 x 0.8 = 0.64)
32% Bb heterozygotes (0.8 x 0.2 x 2 = 0.32)
4% homozygous (bb) for gray coat (0.2 x 0.2 = 0.04)
So 96% of this generation will have black coats; only 4% gray coats.
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After this point, no further change is possible; the population has become homozygous.
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In the cross of homozygous, wild-type females to homozygous, mutant males, all the F1 offspring are heterozygotes and appear normal. In the reciprocal cross, all of the F1 offspring are heterozygotes but have the mutant phenotype (Fig. 3).
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When homozygous tall plants that produce round seeds (TR) are crossed with short plants that produce wrinkled seeds (tr) and the progeny (F1) are self-fertilized, ...
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Heterozygote advantage (or overdominant selection) is an example in which an allele selected against in the homozygous state is retained because of the superiority of heterozygotes.
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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. An organism which has two different alleles of the gene is said to be heterozygous.
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Brachydactyly shortfingeredness; genetic disorder in which the homozygous dominant genotype is not viable
(brachy = short; dactyl = finger or toe)
Bronchus one of the two main branches into which the trachea splits
(bronchus = windpipe) ...
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Deletions are fragments of chromosomes that are missing. They are usually lethal when homozygous and cause abnormalities when heterozygous.
Radiation, viruses, chemicals, and unequal crossing-over may cause them.
Cri du Chat Syndrome ...
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Recessive -- a gene that is phenotypically manifest in the homozygous state but is masked in the presence of a dominant allele.
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