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A dominant allele is a variation of a gene that will produce a certain phenotype, even in the presence of other alleles. A dominant allele typically encodes for a functioning protein. The allele is dominant because one copy of the allele produces enough enzyme to supply a cell with plenty of a given product.
The dominant/recessive character is a relationship between two alleles and must be determined by observation of the heterozygous phenotype. An example of a simple phenotype is the flower colour in Mendel’s peas. One allele as a homozygote produces purple flowers, while the other allele as a homozygote produces white flowers.
Dominant, as related to genetics, refers to the relationship between an observed trait and the two inherited versions of a gene related to that trait. Individuals inherit two versions of each gene, known as alleles, from each parent.
A dominant allele produces a dominant phenotype in individuals who have one copy of the allele, which can come from just one parent. For a recessive allele to produce a recessive phenotype, the individual must have two copies, one from each parent.
Most human cells carry two copies of each chromosome, so usually have two versions of each gene. These different versions of a gene are called alleles. Alleles can either be dominant or recessive, which describes the way their associated traits are inherited.
Dominant alleles are alleles that can express their traits even when paired with recessive alleles. In genetics, alleles are alternative forms of a gene, and they determine the characteristics or traits of an organism.
Uppercase letters represent dominant alleles and lowercase letters indicate recessive alleles. Mendel invented this system but it is not commonly used because not all alleles show complete dominance and many genes have more than two alleles.
Definition. Dominant refers to the relationship between two versions of a gene. Individuals receive two versions of each gene, known as alleles, from each parent. If the alleles of a gene are different, one allele will be expressed; it is the dominant gene.
Mendel’s law of dominance states that in a heterozygote, one trait will conceal the presence of another trait for the same characteristic. Rather than both alleles contributing to a phenotype, the dominant allele will be expressed exclusively.
Some alleles are dominant or recessive. When an organism is heterozygous at a specific locus and carries one dominant and one recessive allele, the organism will express the dominant phenotype.