Dominant Alleles: A Comprehensive Guide to Genetic Variants and Phenotype Expression

dominant allele

the stronger allele. If the dominant allele is present in an offspring, the dominant trait will show up. Represented by a capital letter

A dominant allele is a genetic variant that is expressed in an individual’s phenotype when present on one or both chromosomes of a pair. In other words, the presence of a dominant allele will always manifest in the physical characteristics or traits of the individual, regardless of the presence or absence of other alleles.

Dominant alleles are typically denoted using uppercase letters in genetic notation, while recessive alleles are denoted using lowercase letters. For example, the allele for brown eyes (dominant) is often represented as ‘B’ and the allele for blue eyes (recessive) as ‘b’.

When a dominant allele is present in an individual’s genotype, it will always be expressed in the phenotype, even if there is only one copy of the allele. However, if two copies of a recessive allele are present, then the recessive trait will be expressed.

It’s important to note that dominance is not an inherent property of the allele itself, but rather a result of the interaction between two alleles at the same gene locus. Additionally, not all traits exhibit simple patterns of dominance and recessiveness, and multiple genes can influence the expression of a single phenotype.

More Answers:

Heterozygous Inheritance: The Dominant-Recessive Relationship Between Alleles.
Homozygous Dominant: Definition, Examples, and Relevance in Genetics
Recessive Alleles: Explaining Inheritance Patterns and Genetic Conditions

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