Allele
/əˈliːl/
Definition
Allele refers to one of two or more alternative versions of the same gene at a specific place, called a locus, on a chromosome. In plants, different alleles can produce differences in inherited traits such as flower color, disease resistance, or plant height. A plant usually carries one allele from each parent for each gene, and the combination helps determine how that trait is expressed.
Role in Plant Biology
- Trait differences in plants: Different versions at one gene can influence visible traits such as flower color, leaf shape, plant height, or fruit characteristics when that gene affects pigment, growth, or development.
- Inheritance through breeding: During sexual reproduction, offspring receive one version from each parent, so these genetic combinations help explain why seedlings from the same cross can vary in appearance and vigor.
- Adaptation and survival: Some versions can improve tolerance to drought, salinity, heat, or disease. In wild plant populations, this variation supports adaptation to local environments over generations.
- Value in crop improvement: Plant breeders track useful versions linked to traits such as yield, storage quality, or resistance to specific pathogens, then select parent plants that are more likely to pass those traits on.
Related Terms
Chromosome
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Genotype
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Phenotype
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Hybridization
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Hybrid
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Introgression
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Diploid
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Tetraploid
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