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Difference between Gene and Allele

Difference between Gene and Allele

Genes and alleles are two important terms in genetics. Genes are the basic units of heredity, while alleles are different forms of a gene. In this blog post, we will discuss the difference between genes and alleles, and how they can affect genetic disorders. We’ll also explore some examples of genetic disorders caused by defective genes or alleles.

What is Gene?

Gene is a basic unit of heredity in living organisms. It is composed of DNA and controls the organism’s inherited traits, such as hair color or blood type. Genes are passed down from parents to their offspring, and they play a role in determining an individual’s characteristics. Mutations, or changes in the DNA sequence, can occur spontaneously or be induced by environmental factors, such as UV light or chemicals. These changes can alter the gene’s function, which can result in changes in the organism’s appearance or behavior. Gene therapy is a promising treatment for certain genetic diseases that involves introducing healthy copies of genes into cells to replace defective ones. Gene editing is a newer technology that allows for more precise alterations to the DNA sequence. This technique is being used to develop new treatments for diseases and to improve crops and livestock.

What is Allele?

Alleles are alternative forms of a gene. A gene is a sequence of DNA that codes for a particular protein that functions in one or more specific biochemical processes. Alleles can arise through mutation, which is a permanent change in the DNA sequence. Most often, mutations occur in just a single nucleotide, the building block of DNA. These changes are usually harmless or result in very minor phenotypic changes. In some cases, however, they can have a major impact on health and well-being. Alleles can also be passed down from parents to offspring through sexual reproduction. In diploid organisms, each individual has two alleles for each gene, one from each parent. If the two alleles are identical, the individual is said to be homozygous for that gene. If the alleles are different, the individual is heterozygous. The allele that is expressed in the phenotype is known as the dominant allele, while the allele that is not expressed is known as the recessive allele. However, both alleles may be expressed in the phenotype if they are codominant or if one allele is incompletely dominant over the other.

Difference between Gene and Allele

Gene and allele are two related but distinct concepts in genetics. A gene is a sequence of DNA that codes for a particular protein or RNA molecule. An allele is a variant form of a gene. Most genes have two alleles, one inherited from each parent. For example, the gene for eye color has green and blue alleles. Alleles can be dominant or recessive. A dominant allele will be expressed if it is present, while a recessive allele will only be expressed if both alleles are present. In some cases, one allele may be completely dominant over the other (complete dominance), while in others, both alleles may be partially expressed (incomplete dominance). Gene expression can also be affected by epigenetic factors, such as DNA methylation. So while genes and alleles are related, they are not interchangeable terms.


The difference between a gene and an allele is that a gene is the basic physical and functional unit of heredity, while an allele is one variant form of a gene. Each person has two copies of every gene, one inherited from each parent. Alleles are different forms of a gene that can exist at the same spot on a chromosome.

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