Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An organism that has the same alleles at a particular gene locus on homologous chromosomes.
from The Century Dictionary.
- noun A zygote formed by the union of two gametes of the same kind or stock: opposed to
heterozygote . See extract underheterozygole .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun genetics A
diploid individual that has equalalleles at one or moregenetic loci .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun (genetics) an organism having two identical alleles of a particular gene and so breeding true for the particular characteristic
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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This is where the heterozygote has a higher fitness than either homozygote.
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If the mutation is question is severely deleterious, for example if homozygote embryos invariably die during development to take an extreme example, it can never be fixed.
The Rise of Human Chromosome 2: Beyond the Deme - The Panda's Thumb 2009
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I added it to the list on our Instructors' Blog, stated as follows:Students should be able to define dominance as a particular relationship between the effects of two alleles; dominance is said to exist when the phenotype of the heterozygote is the same as that of a homozygote for one of the alleles the 'dominant' one.
How to teach about dominance Rosie Redfield 2007
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A final, important point is that even with just those two simple mutations the process is convoluted almost to the point of incoherence.17 Even with just the sickle and C genes—with heterozygote versus homozygote advantage and with varying detrimental effects—the interplay of the mutant and normal genes is chaotic and tangled.
The Edge of Evolution Michael J. Behe 2007
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I added it to the list on our Instructors' Blog, stated as follows:Students should be able to define dominance as a particular relationship between the effects of two alleles; dominance is said to exist when the phenotype of the heterozygote is the same as that of a homozygote for one of the alleles the 'dominant' one.
Archive 2007-11-01 Rosie Redfield 2007
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A final, important point is that even with just those two simple mutations the process is convoluted almost to the point of incoherence.17 Even with just the sickle and C genes—with heterozygote versus homozygote advantage and with varying detrimental effects—the interplay of the mutant and normal genes is chaotic and tangled.
The Edge of Evolution Michael J. Behe 2007
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A final, important point is that even with just those two simple mutations the process is convoluted almost to the point of incoherence.17 Even with just the sickle and C genes—with heterozygote versus homozygote advantage and with varying detrimental effects—the interplay of the mutant and normal genes is chaotic and tangled.
The Edge of Evolution Michael J. Behe 2007
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A final, important point is that even with just those two simple mutations the process is convoluted almost to the point of incoherence.17 Even with just the sickle and C genes—with heterozygote versus homozygote advantage and with varying detrimental effects—the interplay of the mutant and normal genes is chaotic and tangled.
The Edge of Evolution Michael J. Behe 2007
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So, the idea is that some allele exists which confers an evolutionary benefit when present in the heterozygote stronger sperm, for example, and confers homosexuality in the homozygote.
"The more we play God or try to improve on Mother Nature, the more damage we are doing with all kinds of experiments that... turn into nightmares." Ann Althouse 2007
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A2A2 homozygote, the lower the equilibrium frequency of A2, for a given value of
Population Genetics Okasha, Samir 2006
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