Example of Homozygous

Homozygous means that both alleles of a pair of genes have the same gene form. In other words, if a gene has two copies of the same allele, it is homozygous for that gene. For example, if a gene contains two copies of the “A” allele, the gene is said to be homozygous for the allele “A.” Similarly, if a gene has two copies of the “a” allele, it is homozygous for the allele “a.”


Homozygous is a term few people have heard of because it is not commonly used in everyday conversation. However, it is a fascinating and uncommon mutation that most people have never heard of. This may appear strange, but it is very common in nature. If you’re wondering what it means to be homozygous instead of heterozygous, this article is for you.

Homozygous is a Latin phrase that means “identical on both sides.” It’s a genetic term that describes when an organism’s male and female parent plants share the same trait or characteristic. Homozygous twins are formed in humans when the zygote splits prematurely without the presence of another fertilized egg. This can result in two genetically identical newborns.

Homozygous is Scientifically Defined As

The simple definition of homozygous is a cell with two identical gene copies. However, the scientific definition is a bit more complex:

“having the same alleles at a given gene locus on homologous chromosomes.”

One must first comprehend the meaning of several fundamental scientific terminologies to interpret the scientific definition.

Allele –  Alleles are distinct forms or variants of a gene.

Chromosomes- Chromosomes are structures that carry genetic information (passed from biological parents to offspring)

Homologous – structurally similar 

Locus – a particular region or site

What’s the Difference Between a Homozygous Inheritance and a Heterozygous Inheritance?

“Heterozygous” is another word for a pair of alleles. In contrast to being homozygous, being heterozygous means having two different alleles. Your parents each gave you a different version.

In a heterozygous genotype, the dominant allele comes first, and the recessive allele comes second. Because of this, the dominant trait will become clear. You are still a carrier even if the recessive trait does not manifest. This means that it is something you can give to your children.

It is the exact opposite of homozygous, in which the dominant or recessive trait of the matching alleles is shown.

Importance Of Homozygous:

Homozygous plays an important role in plant breeding and animal breeding as it increases the yield and helps increase profits for farmers and breeders by increasing their production output with fewer inputs.

The homozygous plants have high yield potentials and produce high-quality seeds, which help you produce high-quality seeds in large quantities, thus making it easier for you to sell them at higher prices.

Homozygous Examples:

Eye Color

Eye color is the most common example of a trait that is inherited in a Mendelian fashion. The gene for eye color is located on chromosome 15 in humans and most other mammals. You will have brown eyes if you inherit two copies of the same allele (or variant) for this gene (one from each parent).

Your eyes will be green or hazel if you inherit one copy of each allele (one from each parent) (depending on whether one of your parents had two copies of the dominant allele). If you have two different alleles for this gene, you will have blue or another color eyes.

Hair Color

Hair color is an excellent example of homozygous vs. heterozygous. Homozygous means having two copies of the same allele for a gene. So if you have one copy of the “red” allele and one copy of the “brown” allele, you’re homozygous for red. However, if you have one copy of each of the “red” and “black” alleles (or any other combination), you are heterozygous because they are not both red.

Because they can be expressed even if only one copy is inherited from your parent, homozygous examples are also known as dominant traits (s).

Skin Color

Skin color is an example of a homozygous trait. You will have the trait associated with that gene if you have two copies of the same gene. You will not have the trait related to that gene if you only have one copy of each allele.

In this case, if both of your parents were dark-skinned, you would also be. If both of your parents have fair skin, you will also have fair skin.


One of the most common types of homozygous conditions is having freckles. Freckles are caused by a recessive gene, meaning you need two copies of the gene to have freckles. You won’t have freckles if only one copy of the gene.

If both parents have one copy of the freckle gene, their child has a 50/50 chance of getting two copies and being born with freckles. If both parents have two copies of the freckle gene, there is a 100% chance that their child will have two copies and be born with freckles.


A homozygous genotype is a trait, disease, or characteristic that runs in families. However, unlike heterozygous genetic traits, those with the same genotype often exhibit the same phenotypic expression of the gene.

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