overdominance
- noun
- /ˌoʊvərˈdɒmɪnəns/
- Specialized
:
sobredominancia
- Research shows that overdominance can enhance the survival rate of certain animals in changing environments.
- overdominance or recessive
- overdominance and depression
Examples
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The overdominance hypothesis (East 1908) argues that heterozygosity confers properties that are superior to either homozygote.
Academic text (2010) -
Thus, if overdominance were an important mechanism (having a fitness advantage at the loci examined), heterozygous advantage would slow the loss of genetic variation caused by drift more than neutral models would predict.
Academic text (2010) -
This was unexpected, given that overdominance for expression is thought to be rare (Gibson et al. 2004).
Academic text (2010) -
What is the underlying cause of inbreeding depression: overdominance or partially recessive deleterious alleles?
Academic text (2010) -
Like a keystone species, Tc might be preventing overdominance by Sv, Fs, or Jc.
Academic text (2001) -
Furthermore, the underlying cause of inbreeding depression, overdominance, or partially recessive deleterious alleles is still debated.
Academic text (2010) -
Experimentally comparable studies by Gibson and colleagues (2004) and Hughes and colleagues (2006) found fewer genes showing significant patterns of overdominance (< 5% of genes) in Drosophila.
Academic text (2010) -
In addition, in the case of overdominance, both allelic variants would have a higher probability of being maintained in the population, which would not be the case where deleterious alleles are being unmasked by inbreeding.
Academic text (2010) -
Results indicated that the expression of approximately 75% of all differentially expressed genes associated with inbreeding depression was additive or dominant, and about 25% of all these genes expressed patterns of overdominance.
Academic text (2010) -
In some plant species, overdominance allows hybrids to thrive better than their purebred parents.
Synonyms
1
9.9
Better growth in a hybrid plant or animal than its parents
How Selected
- Specialized
- Specialized
Surface Forms
Morphology
Etymology
Overdominance breaks into over- ('above' or 'too much') and dominance ('being stronger' or 'control'), and this helps you remember the idea. It describes a genetic case where a living thing with two different versions of a gene is stronger or more likely to survive and reproduce than those with two identical versions.