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).
Contents
- 0.1 What is an Allele? – Meaning and Definition
- 0.2 Allele Definition:
- 0.3 Example of Alleles:
- 0.4 Types of Alleles:
- 0.5 Homozygous vs. Heterozygous:
- 0.6 Importance of Alleles:
- 0.7 What is Allele _ It’s Meaning and Definition One member of a pair (or any of the series).
- 0.8 allele-and-its-dominance.pdf
- 0.9 Basic Genetic Concepts & Terms
- 1 🧬 What is an Allele?
- 2 📘 Definition:
- 3 🔍 Explanation in Simple Terms:
- 4 🧪 Example:
- 5 🔁 Types of Alleles:
- 6 🧠 In a nutshell:
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:
- Dominant Allele: Expressed in the organism even if only one copy is present. Represented by a capital letter (e.g., A).
- Recessive Allele: Expressed only when two copies are present. Represented by a lowercase letter (e.g., a).
- Codominant Alleles: Both alleles are equally expressed. Example: Blood type AB.
- 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:
| Type | Description |
|---|---|
| Dominant allele | Expressed even if only one copy is present (e.g., A) |
| Recessive allele | Expressed only when two copies are present (e.g., a) |
| Homozygous | Same alleles (AA or aa) |
| Heterozygous | Different alleles (Aa) |
🧠 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:
-
📑 A diagram explaining allele pairs?
-
🌱 A Hindi explanation?
-
🧠 Practice MCQs for NEET or school tests?
Let me know and I’ll prepare it for you!
