What is Allele _ It’s Meaning and Definition One member of a pair (or any of the series).

What is Allele _ It’s Meaning and Definition One member of a pair (or any of the series).

What is an Allele? – Meaning and Definition

Allele Definition:

An allele is one of the different forms of a gene that can exist at a specific spot (locus) on a chromosome. Alleles influence the traits of an organism, such as eye color, hair color, and blood type.

 Example of Alleles:

• For the eye color gene, there may be an allele for brown eyes (dominant) and an allele for blue eyes (recessive).
• In the case of blood type, the ABO gene has three alleles: A, B, and O.

 Types of Alleles:

1. Dominant Allele: Expressed in the organism even if only one copy is present. Represented by a capital letter (e.g., A).
2. Recessive Allele: Expressed only when two copies are present. Represented by a lowercase letter (e.g., a).
3. Codominant Alleles: Both alleles are equally expressed. Example: Blood type AB.
4. Multiple Alleles: More than two possible alleles for a gene exist. Example: ABO blood group.

 Homozygous vs. Heterozygous:

• Homozygous: When both alleles for a gene are the same (AA or aa).
• Heterozygous: When the two alleles for a gene are different (Aa).

 Importance of Alleles:

Alleles are essential for genetic variation, influencing traits and evolution. They determine inherited characteristics and contribute to an organism’s adaptability to its environment.

If you need more in-depth information or have specific questions, feel free to ask!

What is Allele _ It’s Meaning and Definition One member of a pair (or any of the series).

allele-and-its-dominance.pdf

Basic Genetic Concepts & Terms

Here’s a clear and simple explanation of Allele, including its meaning, definition, and examples — perfect for biology students and exam preparation.

What is an Allele?

Meaning:

An allele is one version of a gene. Every gene has different forms or variations, and each of these forms is called an allele.

Definition:

An allele is one of two or more alternative forms of a gene that arise by mutation and are found at the same place (locus) on a chromosome.

Explanation in Simple Terms:

• We inherit two alleles for each gene — one from our mother, one from our father.

• These alleles may be the same or different.

Example:

Let’s say a gene controls flower color in a plant:

• One allele may code for red color.

• Another allele may code for white color.

So:

• If the plant inherits two red alleles → flowers are red.

• If it inherits one red and one white → color depends on dominance.

Types of Alleles:

In a nutshell:

• Gene = section of DNA coding for a trait

• Allele = variation of that gene

• Locus = position of the gene/allele on chromosome

Would you like:

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What is Allele _ It’s Meaning and Definition One member of a pair (or any of the series).

Multiple Alleles