one whose trait always shows up in the organism when the allele is present
In genetics, the term “dominant” is used to describe an allele that always shows up as a trait in an organism when it is present
In genetics, the term “dominant” is used to describe an allele that always shows up as a trait in an organism when it is present. Dominant alleles are represented by uppercase letters, while their recessive counterparts are represented by lowercase letters.
When an organism inherits two copies of a dominant allele (AA) or one copy of a dominant allele and one copy of a recessive allele (Aa), the dominant trait will always be expressed. For example, if we consider the trait of flower color in a plant species, where purple flowers are dominant (P) and white flowers are recessive (p), an organism with the genotype PP or Pp will always have purple flowers.
Even in the presence of a single dominant allele (Aa), the dominant trait will take precedence over the recessive trait. In this case, the recessive trait will only be expressed if an organism inherits two copies of the recessive allele (aa). Using the flower color example, if an organism has the genotype Pp, it will still exhibit the dominant trait of purple flowers.
It is important to note that dominance does not imply that a particular allele is more common or advantageous. Dominant alleles are simply expressed whenever present, while recessive alleles are only expressed when there are no dominant alleles present.
More Answers:
The Influence of Genetic Makeup and Environmental Factors on an Organism’s Visible Traits: Insights into Evolutionary History and Taxonomic RelationshipsUnraveling the Genetic Blueprint: Understanding the Significance of an Organism’s Genome
Unveiling the Masked Allele: Understanding Dominant and Recessive Alleles in Genetics