Understanding Homozygous Definition

Explore the definition of homozygous, examples, case studies, and statistics to understand its significance in genetics.


When it comes to genetics, the term ‘homozygous’ plays a crucial role in understanding how traits are inherited from parents to offspring. In this article, we will dive into the definition of homozygous, explore examples, case studies, and statistics to shed light on its importance in genetics.

What is Homozygous?

Homozygous refers to the presence of two identical alleles for a particular gene. These alleles can be either dominant or recessive, and their presence can have a significant impact on an individual’s phenotype.

Examples of Homozygous

One common example of homozygous is in the case of eye color. If an individual inherits two alleles for brown eyes (BB), they are considered homozygous for brown eyes. Similarly, if someone inherits two alleles for blue eyes (bb), they are homozygous for blue eyes.

Case Studies

In a study conducted on a population of fruit flies, researchers found that individuals who were homozygous for a certain gene had a higher chance of surviving in a harsh environment compared to heterozygous individuals. This emphasizes the role of homozygosity in determining an organism’s ability to adapt to environmental changes.

Statistics on Homozygous Traits

According to genetic studies, approximately 1 in 4 individuals in a population are homozygous for a particular trait. This ratio is essential in understanding the genetic diversity within a population and how certain traits are maintained or depleted over generations.


Understanding the concept of homozygous is crucial in unraveling the complexities of genetic inheritance. By studying examples, case studies, and statistics related to homozygosity, we can gain valuable insights into how traits are passed down from one generation to the next.

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